2005 Hummer H2 Owners Manual

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crash in which you or others could be injured. Use only the trailer brake harness intended for your vehicle. If it is no longer available to you, be sure to get a proper replacement from your dealer. This harness is for an electric brake controller and includes a trailer battery feed fuse. It should be installed by your dealer or a qualiﬁed service center. This harness may be included with your vehicle as part of the heavy-duty trailer wiring package. 4-79 Four-Wire Harness Adapter This adapter may be included with your vehicle as part of the heavy-duty trailer wiring package. Use this adapter to connect a standard four-way round pin connector to the seven-wire harness on your vehicle. Connect the adapter with the tab pointing up. The ﬂip cap on the vehicle’s seven-wire harness will lock onto the tab (see arrow in the previous graphic) and help hold the adapter in place. Plug the four-way round pin connector onto the adapter. 4-80 Section 5 Service and Appearance Care Service ............................................................5-3 Doing Your Own Service Work .........................5-4 Adding Equipment to the Outside of Your Vehicle ......................................................5-5 Fuel ................................................................5-5 Gasoline Octane ............................................5-5 Gasoline Speciﬁcations ....................................5-5 California Fuel ...............................................5-5 Additives .......................................................5-6 Fuels in Foreign Countries ...............................5-6 Filling Your Tank ............................................5-7 Filling a Portable Fuel Container .......................5-9 Checking Things Under the Hood .....................5-9 Hood Release ..............................................5-10 Engine Compartment Overview .......................5-12 Engine Oil ...................................................5-13 Engine Oil Life System ..................................5-16 Engine Air Cleaner/Filter ................................5-18 Automatic Transmission Fluid .........................5-21 Engine Coolant .............................................5-24 Coolant Surge Tank Pressure Cap ..................5-26 Engine Overheating .......................................5-26 Overheated Engine Protection Operating Mode ........................................5-28 Cooling System ............................................5-29 Power Steering Fluid .....................................5-33 Windshield Washer Fluid ................................5-34 Brakes ........................................................5-35 Battery ........................................................5-38 Jump Starting ...............................................5-39 All-Wheel Drive ..............................................5-43 Rear Axle .......................................................5-44 Front Axle ......................................................5-44 Bulb Replacement ..........................................5-45 Halogen Bulbs ..............................................5-45 Headlamps ..................................................5-46 Front Turn Signal and Parking Lamps ..........................................5-47 Daytime Running Lamps ................................5-47 Roof Marker Lamps ......................................5-48 Taillamps .....................................................5-50 Replacement Bulbs .......................................5-52 Windshield Wiper Blade Replacement ..............5-53 Tires ..............................................................5-54 Tire Sidewall Labelling ...................................5-55 Tire Terminology and Deﬁnitions .....................5-58 Inﬂation - Tire Pressure .................................5-60 Tire Inspection and Rotation ...........................5-61 When It Is Time for New Tires .......................5-63 Buying New Tires .........................................5-63 Uniform Tire Quality Grading ..........................5-64 5-1 Section 5 Service and Appearance Care Wheel Alignment and Tire Balance ..................5-65 Wheel Replacement ......................................5-66 Tire Chains ..................................................5-67 Accessory Inﬂator .........................................5-67 If a Tire Goes Flat ........................................5-69 Changing a Flat Tire .....................................5-70 Removing the Spare Tire and Tools ................5-71 Removing the Flat Tire and Installing the Spare Tire ................................................5-79 Storing a Flat or Spare Tire and Tools ............5-86 Spare Tire ...................................................5-91 Appearance Care ............................................5-92 Fabric/Carpet ...............................................5-92 Vinyl ...........................................................5-94 Leather .......................................................5-94 Instrument Panel ..........................................5-94 Interior Plastic Components ............................5-94 Wood Panels ...............................................5-95 Speaker Covers ............................................5-95 Glass Surfaces .............................................5-95 Care of Safety Belts ......................................5-95 Weatherstrips ...............................................5-95 Washing Your Vehicle ...................................5-96 Cleaning Exterior Lamps/Lenses .....................5-97 Finish Care ..................................................5-97 Windshield, Backglass, and Wiper Blades .........5-98 Aluminum Wheels .........................................5-98 Tires ...........................................................5-99 Sheet Metal Damage .....................................5-99 Finish Damage .............................................5-99 Underbody Maintenance ................................5-99 Chemical Paint Spotting .................................5-99 Vehicle Care/Appearance Materials ................5-100 Vehicle Identiﬁcation .....................................5-101 Vehicle Identiﬁcation Number (VIN) ................5-101 Service Parts Identiﬁcation Label ...................5-101 Electrical System ..........................................5-102 Add-On Electrical Equipment .........................5-102 Windshield Wiper Fuses ...............................5-102 Power Windows and Other Power Options ........................................5-102 Fuses and Circuit Breakers ..........................5-103 Instrument Panel Fuse Block ........................5-103 Center Instrument Panel Fuse Block ..............5-106 Underhood Fuse Block ................................5-107 Capacities and Speciﬁcations ........................5-112 5-2 Service Your dealer knows your vehicle best and wants you to be happy with it. We hope you will go to your dealer for all your service needs. You will get genuine GM parts and GM-trained and supported service people. We hope you will want to keep your GM vehicle all GM. Genuine GM parts have one of these marks: California Proposition 65 Warning Most motor vehicles, including this one, contain and/or emit chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Engine exhaust, many parts and systems (including some inside the vehicle), many ﬂuids, and some component wear by-products contain and/or emit these chemicals. 5-3 {CAUTION: You can be injured and your vehicle could be damaged if you try to do service work on a vehicle without knowing enough about it. (cid:127) Be sure you have sufficient knowledge, experience, the proper replacement parts and tools before you attempt any vehicle maintenance task. (cid:127) Be sure to use the proper nuts, bolts and other fasteners. English and metric fasteners can be easily confused. If you use the wrong fasteners, parts can later break or fall off. You could be hurt. Doing Your Own Service Work If you want to do some of your own service work, you will want to use the proper service manual. It tells you much more about how to service your vehicle than this manual can. To order the proper service manual, see Service Publications Ordering Information on page 7-11. Your vehicle has an airbag system. Before attempting to do your own service work, see Servicing Your Airbag-Equipped Vehicle on page 1-68. You should keep a record with all parts receipts and list the mileage and the date of any service work you perform. See Maintenance Record on page 6-15. 5-4 Adding Equipment to the Outside of Your Vehicle Things you might add to the outside of your vehicle can affect the airﬂow around it. This may cause wind noise and affect windshield washer performance. Check with your dealer before adding equipment to the outside of your vehicle. Fuel The 8th digit of your vehicle identiﬁcation number (VIN) shows the code letter or number that identiﬁes your engine. You will ﬁnd the VIN at the top left of the instrument panel. See Vehicle Identiﬁcation Number (VIN) on page 5-101. Gasoline Octane Use regular unleaded gasoline with a posted octane of 87 or higher. If the octane is less than 87, you may get a heavy knocking noise when you drive. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you might damage your engine. A little pinging noise when you accelerate or drive uphill is considered normal. This does not indicate a problem exists or that a higher-octane fuel is necessary. If you are using 87 octane or higher-octane fuel and hear heavy knocking, your engine needs service. Gasoline Speciﬁcations It is recommended that gasoline meet speciﬁcations which were developed by automobile manufacturers around the world and contained in the World-Wide Fuel Charter which is available from the Alliance of Automobile Manufacturers at www.autoalliance.org/fuel_charter.htm. Gasoline meeting these speciﬁcations could provide improved driveability and emission control system performance compared to other gasoline. California Fuel If your vehicle is certiﬁed to meet California Emission Standards (see the underhood emission control label), it is designed to operate on fuels that meet California speciﬁcations. If this fuel is not available in states adopting California emissions standards, your vehicle will operate satisfactorily on fuels meeting federal speciﬁcations, but emission control system performance may be affected. The malfunction indicator lamp may turn on and your vehicle may fail a smog-check test. See Malfunction Indicator Lamp on page 3-37. If this occurs, return to your authorized GM dealer for diagnosis. If it is determined that the condition is caused by the type of fuel used, repairs may not be covered by your warranty. 5-5 Some gasolines that are not reformulated for low emissions may contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask the attendant where you buy gasoline whether the fuel contains MMT. General Motors does not recommend the use of such gasolines. Fuels containing MMT can reduce the life of spark plugs and the performance of the emission control system may be affected. The malfunction indicator lamp may turn on. If this occurs, return to your authorized GM dealer for service. Fuels in Foreign Countries If you plan on driving in another country outside the United States or Canada, the proper fuel may be hard to ﬁnd. Never use leaded gasoline or any other fuel not recommended in the previous text on fuel. Costly repairs caused by use of improper fuel would not be covered by your warranty. To check the fuel availability, ask an auto club, or contact a major oil company that does business in the country where you will be driving. Additives To provide cleaner air, all gasolines in the United States are now required to contain additives that will help prevent engine and fuel system deposits from forming, allowing your emission control system to work properly. You should not have to add anything to your fuel. However, some gasolines contain only the minimum amount of additive required to meet U.S. Environmental Protection Agency regulations. General Motors recommends that you buy gasolines that are advertised to help keep fuel injectors and intake valves clean. If your vehicle experiences problems due to dirty injectors or valves, try a different brand of gasoline. Gasolines containing oxygenates, such as ethers and ethanol, and reformulated gasolines may be available in your area to contribute to clean air. General Motors recommends that you use these gasolines, particularly if they comply with the speciﬁcations described earlier. Notice: Your vehicle was not designed for fuel that contains methanol. Do not use fuel containing methanol. It can corrode metal parts in your fuel system and also damage the plastic and rubber parts. That damage would not be covered under your warranty. 5-6 Filling Your Tank {CAUTION: Fuel vapor burns violently and a fuel ﬁre can cause bad injuries. To help avoid injuries to you and others, read and follow all the instructions on the pump island. Turn off your engine when you are refueling. Do not smoke if you are near fuel or refueling your vehicle. Keep sparks, ﬂames and smoking materials away from fuel. Do not leave the fuel pump unattended when refueling your vehicle — this is against the law in some places. Keep children away from the fuel pump; never let children pump fuel. The fuel cap is located on the driver’s side of the vehicle. Some vehicles may be equipped with a fuel door. Open the door to access the fuel cap. Some vehicles may be equipped with a locking fuel cap. Use the fuel cap key to unlock the fuel cap. If you ever need a replacement key, your dealer can help you get one. 5-7 To remove the fuel cap, turn it slowly to the left (counterclockwise). While refueling, let the fuel cap hang by the tether, if it has one. {CAUTION: If a ﬁre starts while you are refueling, do not remove the nozzle. Shut off the ﬂow of fuel by shutting off the pump or by notifying the station attendant. Leave the area immediately. If you need a new fuel cap, be sure to get Notice: the right type. Your dealer can get one for you. If you get the wrong type, it may not ﬁt properly. This may cause your malfunction indicator lamp to light and may damage your fuel tank and emissions system. See Malfunction Indicator Lamp on page 3-37. {CAUTION: If you spill fuel and then something ignites it, you could be badly burned. Fuel can spray out on you if you open the fuel cap too quickly. This spray can happen if your tank is nearly full, and is more likely in hot weather. Open the fuel cap slowly and wait for any hiss noise to stop. Then unscrew the cap all the way. Be careful not to spill fuel. Do not top off or overﬁll the tank and wait a few seconds after you have ﬁnished pumping before removing the nozzle. Clean fuel from painted surfaces as soon as possible. See Washing Your Vehicle on page 5-96. When replacing the fuel cap, turn it to the right (clockwise) until it clicks. Make sure the cap is fully installed. The diagnostic system can determine if the fuel cap has been left off or improperly installed. This would allow fuel to evaporate into the atmosphere. See Malfunction Indicator Lamp on page 3-37. 5-8 Filling a Portable Fuel Container {CAUTION: Never ﬁll a portable fuel container while it is in your vehicle. Static electricity discharge from the container can ignite the gasoline vapor. You can be badly burned and your vehicle damaged if this occurs. To help avoid injury to you and others: (cid:127) Dispense gasoline only into approved containers. (cid:127) Do not ﬁll a container while it is inside a vehicle, in a vehicle’s trunk, pickup bed or on any surface other than the ground. (cid:127) Bring the ﬁll nozzle in contact with the inside of the ﬁll opening before operating the nozzle. Contact should be maintained until the ﬁlling is complete. (cid:127) Do not smoke while pumping gasoline. Checking Things Under the Hood {CAUTION: Things that burn can get on hot engine parts and start a ﬁre. These include liquids like fuel, oil, coolant, brake ﬂuid, windshield washer and other ﬂuids, and plastic or rubber. You or others could be burned. Be careful not to drop or spill things that will burn onto a hot engine. 5-9 Hood Release To open the hood, do the following: 2. Pull the handle located inside the vehicle to the lower left of the steering wheel. 1. Release both hood side latches. 5-10 3. Then go to the front of the vehicle and pull the assist handles toward you to lift the hood. 4. Pull the hood open until it is supported by the cables. Before closing the hood, be sure all ﬁller caps are on properly. To close the hood, do the following: 1. Hold up the hood a few inches from the closed position and then let it go so that it has enough force to engage the hood latch. 2. Pull up on the assist handles to be sure that the hood is latched. 3. Latch both hood side latches. 5-11 Engine Compartment Overview When you open the hood on the VORTEC™ 6000 V8 engine here is what you will see: 5-12 A. Coolant Surge Tank. See Cooling System on page 5-29 and Coolant Surge Tank Pressure Cap on page 5-26. B. Engine Air Cleaner/Filter and Air Filter Restriction Indicator (If Equipped). See Engine Air Cleaner/Filter on page 5-18. C. Windshield Washer Fluid Reservoir. See “Adding Washer Fluid” under Windshield Washer Fluid on page 5-34. D. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine Oil on page 5-13. E. Engine Oil Dipstick. See “Checking Engine Oil” under Engine Oil on page 5-13. F. Automatic Transmission Fluid Dipstick. See “Checking the Fluid Level” under Automatic Transmission Fluid on page 5-21. G. Fan. See Cooling System on page 5-29. H. Remote Negative (−) Terminal (GND). See Jump Starting on page 5-39. I. Power Steering Fluid Reservoir (Out of View). See Power Steering Fluid on page 5-33. J. Remote Positive (+) Terminal. See Jump Starting on page 5-39. K. Brake Fluid Reservoir. See “Brake Fluid” under Brakes on page 5-35. L. Underhood Fuse Block. See Underhood Fuse Block on page 5-107. M. Battery. See Battery on page 5-38. Engine Oil If the CHECK OIL LEVEL message appears on the Driver Information Center (DIC), it means you need to check your engine oil level right away. For more information, see CHECK OIL LEVEL under DIC Warnings and Messages on page 3-47. You should check your engine oil level regularly; this is an added reminder. Checking Engine Oil It is a good idea to check your engine oil every time you get fuel. In order to get an accurate reading, the oil must be warm and the vehicle must be on level ground. The engine oil dipstick handle is a yellow loop. See Engine Compartment Overview on page 5-12 for the location of the engine oil dipstick. 1. Turn off the engine and give the oil several minutes to drain back into the oil pan. If you do not do this, the oil dipstick might not show the actual level. 2. Pull out the dipstick and clean it with a paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level. 5-13 See Engine Compartment Overview on page 5-12 for the location of the engine oil ﬁll cap. When to Add Engine Oil If the oil is at or below the cross-hatched area at the tip of the dipstick, then you will need to add at least one quart of oil. But you must use the right kind. This section explains what kind of oil to use. For engine oil crankcase capacity, see Capacities and Speciﬁcations on page 5-112. Notice: Do not add too much oil. If your engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, your engine could be damaged. Be sure to add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back in when you are through. What Kind of Engine Oil to Use Look for two things: (cid:127) GM6094M Your vehicle’s engine requires oil meeting GM Standard GM6094M. You should look for and use only an oil that meets GM Standard GM6094M. 5-14 (cid:127) SAE 5W-30 As shown in the viscosity chart, SAE 5W-30 is best for your vehicle. However, if it is going to be 0°F (–18°C) or above and SAE 5W-30 is not available, you may use SAE 10W-30. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 20W-50. Oils meeting these requirements should also have the starburst symbol on the container. This symbol indicates that the oil has been certiﬁed by the American Petroleum Institute (API). You should look for this information on the oil container, and use only those oils that are identiﬁed as meeting GM Standard GM6094M and have the starburst symbol on the front of the oil container. 5-15 Notice: Use only engine oil identiﬁed as meeting GM Standard GM6094M and showing the American Petroleum Institute Certiﬁed For Gasoline Engines starburst symbol. Failure to use the recommended oil can result in engine damage not covered by your warranty. GM Goodwrench® oil meets all the requirements for your vehicle. If you are in an area of extreme cold, where the temperature falls below −20°F (−29°C), it is recommended that you use either an SAE 5W-30 synthetic oil or an SAE 0W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. Engine Oil Additives Do not add anything to your oil. The recommended oils with the starburst symbol that meet GM Standard GM6094M are all you will need for good performance and engine protection. Engine Oil Life System When to Change Engine Oil Your vehicle has a computer system that lets you know when to change the engine oil and ﬁlter. This is based on engine revolutions and engine temperature, and not on mileage. Based on driving conditions, the mileage at which an oil change will be indicated can vary considerably. For the oil life system to work properly, you must reset the system every time the oil is changed. When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A CHANGE ENGINE OIL message will come on. Change your oil as soon as possible within the next 600 miles (1 000 km). It is possible that, if you are driving under the best conditions, the oil life system may not indicate that an oil change is necessary for over a year. However, your engine oil and ﬁlter must be changed at least once a year and at this time the system must be reset. Your dealer has GM-trained service people who will perform this work using genuine GM parts and reset the system. It is also important to check your oil regularly and keep it at the proper level. If the system is ever reset accidentally, you must change your oil at 3,000 miles (5 000 km) since your last oil change. Remember to reset the oil life system whenever the oil is changed. 5-16 What to Do with Used Oil Used engine oil contains certain elements that may be unhealthy for your skin and could even cause cancer. Do not let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly dispose of clothing or rags containing used engine oil. See the manufacturer’s warnings about the use and disposal of oil products. Used oil can be a threat to the environment. If you change your own oil, be sure to drain all the oil from the ﬁlter before disposal. Never dispose of oil by putting it in the trash, pouring it on the ground, into sewers, or into streams or bodies of water. Instead, recycle it by taking it to a place that collects used oil. If you have a problem properly disposing of your used oil, ask your dealer, a service station or a local recycling center for help. How to Reset the Engine Oil Life System The Engine Oil Life System calculates when to change your engine oil and ﬁlter based on vehicle use. Anytime your oil is changed, reset the system so it can calculate when the next oil change is required. If a situation occurs where you change your oil prior to a CHANGE ENGINE OIL message being turned on, reset the system. To reset the CHANGE ENGINE OIL message, see “Engine Oil Life System” under DIC Operation and Displays on page 3-44 for vehicles equipped with the DIC, or do the following: 1. Turn the ignition key to RUN with the engine off. 2. Fully press and release the accelerator pedal slowly three times within ﬁve seconds. If the OIL LIFE RESET message ﬂashes for 10 seconds, the system is resetting. 3. Turn the key to LOCK. If the CHANGE ENGINE OIL message comes back on when you start your vehicle, the engine oil life system has not reset. Repeat the procedure. If it still does not reset, see your dealer for service. 5-17 Engine Air Cleaner/Filter See Engine Compartment Overview on page 5-12 for the location of the engine air cleaner/ﬁlter and the air ﬁlter restriction indicator (if equipped). If you spray water into the engine air Notice: cleaner/ﬁlter intake and water enters the engine air cleaner/ﬁlter housing, as shown in the illustration, you could damage your vehicle’s engine. The repairs would not be covered by your warranty. Do not spray water into the engine air cleaner/ﬁlter intake and/or housing. When to Inspect If your vehicle is equipped with an air ﬁlter restriction indicator, it lets you know when the engine air cleaner/ﬁlter needs to be replaced. On vehicles with a restriction indicator, you should inspect the air ﬁlter restriction indicator at every oil change and replace the engine air cleaner/ﬁlter when the indicator tells you to. On vehicles without an air ﬁlter restriction indicator, you should inspect the air cleaner/ﬁlter at every oil change and replace it at the ﬁrst oil change after 100,000 miles (160 000 km). See Scheduled Maintenance on page 6-4 for more information. 5-18 How to Inspect Vehicles with an Air Filter Restriction Indicator Locate the air ﬁlter restriction indicator on the engine air duct. When the indicator turns black or is in the red/orange “change” zone, replace the ﬁlter and reset the indicator. See “Replacing the Engine Air Cleaner/Filter and Resetting the Air Filter Restriction Indicator” later in this section for further instructions. Vehicles without an Air Filter Restriction Indicator To inspect the air cleaner/ﬁlter, remove it from the vehicle and lightly shake the ﬁlter to release loose dust and dirt. If the engine air cleaner/ﬁlter remains caked with dirt, a new ﬁlter is required. See “Replacing the Engine Air Cleaner/Filter and Resetting the Air Filter Restriction Indicator” later in this section for further instructions. Inspecting the Engine Air Cleaner/Filter and Resetting the Air Filter Restriction Indicator 1. Loosen the screws on the engine air cleaner/ﬁlter cover. 5-19 7. Reset the air ﬁlter restriction indicator, if equipped, by pressing the top button on the indicator. If your vehicle is not equipped with the air ﬁlter restriction indicator, refer to the Maintenance Schedule to determine when to replace the engine air cleaner/ﬁlter. See Owner Checks and Services on page 6-9. {CAUTION: Operating the engine with the air cleaner/ﬁlter off can cause you or others to be burned. The air cleaner not only cleans the air; it helps to stop ﬂame if the engine backﬁres. If it is not there and the engine backﬁres, you could be burned. Do not drive with it off, and be careful working on the engine with the air cleaner/ﬁlter off. If the air cleaner/ﬁlter is off, a backﬁre can Notice: cause a damaging engine ﬁre. And, dirt can easily get into your engine, which will damage it. Always have the air cleaner/ﬁlter in place when you are driving. 2. Lift the cover upward and set it aside. 3. Pull the air cleaner/ﬁlter up and out from the air cleaner housing. Care should be taken to dislodge as little dirt as possible. 4. Clean the air cleaner/ﬁlter sealing surfaces and the housing. 5. Inspect or replace the engine air cleaner/ﬁlter. 6. Reinstall the cover and tighten the screws. 5-20 Automatic Transmission Fluid When to Check and Change A good time to check your automatic transmission ﬂuid level is when the engine oil is changed. Change both the ﬂuid and ﬁlter every 50,000 miles (83 000 km) if the vehicle is mainly driven under one or more of these conditions: In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. In hilly or mountainous terrain. (cid:127) When doing frequent trailer towing. (cid:127) Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any of these conditions, change the ﬂuid and ﬁlter every 100,000 miles (166 000 km). See Scheduled Maintenance on page 6-4. How to Check Because this operation can be a little difficult, you may choose to have this done at the dealership service department. If you do it yourself, be sure to follow all the instructions here, or you could get a false reading on the dipstick. Notice: Too much or too little ﬂuid can damage your transmission. Too much can mean that some of the ﬂuid could come out and fall on hot engine part or exhaust system parts, starting a ﬁre. Too little ﬂuid could cause the transmission to overheat. Be sure to get an accurate reading if you check your transmission ﬂuid. Wait at least 30 minutes before checking the transmission ﬂuid level if you have been driving: (cid:127) When outside temperatures are above 90°F (32°C). (cid:127) At high speed for quite a while. In heavy traffic — especially in hot weather. (cid:127) While pulling a trailer. To get the right reading, the ﬂuid should be at normal operating temperature, which is 180°F to 200°F (82°C to 93°C). 5-21 (cid:127) (cid:127) (cid:127) Get the vehicle warmed up by driving about 15 miles (24 km) when outside temperatures are above 50°F (10°C). If it is colder than 50°F (10°C), drive the vehicle in THIRD (3) until the engine temperature gage moves and then remains steady for 10 minutes. A cold ﬂuid check can be made after the vehicle has been sitting for eight hours or more with the engine off, but this is used only as a reference. Let the engine run at idle for ﬁve minutes if outside temperatures are 50°F (10°C) or more. If it is colder than 50°F (10°C), you may have to idle the engine longer. Should the ﬂuid level be low during this cold check, you must check the ﬂuid hot before adding ﬂuid. Checking the ﬂuid hot will give you a more accurate reading of the ﬂuid level. Checking the Fluid Level Prepare your vehicle as follows: (cid:127) Park your vehicle on a level place. Keep the engine running. (cid:127) With the parking brake applied, place the shift lever in PARK (P). (cid:127) With your foot on the brake pedal, move the shift lever through each gear range, pausing for about three seconds in each range. Then, position the shift lever in PARK (P). Let the engine run at idle for three minutes or more. Then, without shutting off the engine, follow these steps: The transmission dipstick handle with this graphic is located at the rear of the engine compartment, on the passenger’s side of the vehicle. See Engine Compartment Overview on page 5-12 for more information on location. 1. Flip the handle up and then pull out the dipstick and wipe it with a clean rag or paper towel. 2. Push it back in all the way, wait three seconds and then pull it back out again. 5-22 (cid:127) 3. Check both sides of the dipstick, and read the lower level. The ﬂuid level must be in the COLD area, below the cross-hatched area, for a cold check or in the HOT or cross-hatched area for a hot check. Be sure to keep the dipstick pointed down to get an accurate reading. 4. If the ﬂuid level is in the acceptable range, push the dipstick back in all the way; then ﬂip the handle down to lock the dipstick in place. How to Add Fluid Refer to the Maintenance Schedule to determine what kind of transmission ﬂuid to use. See Recommended Fluids and Lubricants on page 6-12. Add ﬂuid only after checking the transmission ﬂuid while it is hot. A cold check is used only as a reference. If the ﬂuid level is low, add only enough of the proper ﬂuid to bring the level up to the HOT area for a hot check. It does not take much ﬂuid, generally less than one pint (0.5 L). Do not overﬁll. Notice: Use of automatic transmission ﬂuid labeled other than DEXRON®-III, Approved for the H-Speciﬁcation, may damage your vehicle, and the damages may not be covered by your warranty. Always use automatic transmission ﬂuid labeled DEXRON®-III, Approved for the H-Speciﬁcation. (cid:127) After adding ﬂuid, recheck the ﬂuid level as described under “How to Check,” earlier in this section. (cid:127) When the correct ﬂuid level is obtained, push the dipstick back in all the way; then ﬂip the handle down to lock the dipstick in place. 5-23 Engine Coolant The cooling system in your vehicle is ﬁlled with DEX-COOL® engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000 miles (240 000 km), whichever occurs ﬁrst, if you add only DEX-COOL® extended life coolant. The following explains your cooling system and how to add coolant when it is low. If you have a problem with engine overheating, see Engine Overheating on page 5-26. A 50/50 mixture of clean, drinkable water and DEX-COOL® coolant will: (cid:127) Give freezing protection down to −34°F (−37°C). (cid:127) Give boiling protection up to 265°F (129°C). (cid:127) Protect against rust and corrosion. (cid:127) Help keep the proper engine temperature. Let the warning lights and gages work as they should. Notice: Using coolant other than DEX-COOL® may cause premature engine, heater core or radiator corrosion. In addition, the engine coolant may require changing sooner, at 30,000 miles (50 000 km) or 24 months, whichever occurs ﬁrst. Any repairs would not be covered by your warranty. Always use DEX-COOL® (silicate-free) coolant in your vehicle. 5-24 What to Use Use a mixture of one-half clean, drinkable water and one-half DEX-COOL® coolant which will not damage aluminum parts. If you use this coolant mixture, you do not need to add anything else. {CAUTION: Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid such as alcohol, can boil before the proper coolant mixture will. Your vehicle’s coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, your engine could get too hot but you would not get the overheat warning. Your engine could catch ﬁre and you or others could be burned. Use a 50/50 mixture of clean, drinkable water and DEX-COOL® coolant. If you use an improper coolant mixture, Notice: your engine could overheat and be badly damaged. The repair cost would not be covered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. (cid:127) If you use the proper coolant, you do not If you have to add coolant more than four times a year, have your dealer check your cooling system. Notice: have to add extra inhibitors or additives which claim to improve the system. These can be harmful. Checking Coolant The coolant surge tank is located in the engine compartment on the passenger’s side of the vehicle. See Engine Compartment Overview on page 5-12 for more information on location. {CAUTION: Turning the surge tank pressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. Never turn the surge tank pressure cap — even a little — when the engine and radiator are hot. The vehicle must be on a level surface. When your engine is cold, the coolant level should be at the FULL COLD mark. If your vehicle is equipped with the LOW COOLANT LEVEL message and it comes on and stays on, it means you are low on engine coolant. See “Low Coolant Level” under DIC Warnings and Messages on page 3-47. 5-25 Adding Coolant If you need more coolant, add the proper DEX-COOL® coolant mixture at the surge tank, but only when the engine is cool. {CAUTION: You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. When replacing the pressure cap, make sure it is hand-tight. Coolant Surge Tank Pressure Cap The coolant surge tank pressure cap must be fully installed on the coolant surge tank. See Engine Compartment Overview on page 5-12 for more information on location. Notice: installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. If the pressure cap is not tightly Engine Overheating You will ﬁnd a coolant temperature gage on your vehicle’s instrument panel. See Engine Coolant Temperature Gage on page 3-35. In addition, you will ﬁnd an ENGINE COOLANT HOT, ENGINE OVERHEATED and a REDUCED ENGINE POWER message in the Driver Information Center (DIC) on the instrument panel. See DIC Warnings and Messages on page 3-47. 5-26 If Steam Is Coming From Your Engine {CAUTION: Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Just turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood. If you keep driving when your engine is overheated, the liquids in it can catch ﬁre. You or others could be badly burned. Stop your engine if it overheats, and get out of the vehicle until the engine is cool. See Overheated Engine Protection Operating Mode on page 5-28 for information on driving to a safe place in an emergency. If your engine catches ﬁre because you Notice: keep driving with no coolant, your vehicle can be badly damaged. The costly repairs would not be covered by your warranty. See Overheated Engine Protection Operating Mode on page 5-28 for information on driving to a safe place in an emergency. If No Steam Is Coming From Your Engine An overheat warning, along with a low coolant condition, can indicate a serious problem. If you get an engine overheat warning, but see or hear no steam, the problem may not be too serious. Sometimes the engine can get a little too hot when you: (cid:127) Climb a long hill on a hot day. (cid:127) Stop after high-speed driving. Idle for long periods in traffic. Tow a trailer. See Towing a Trailer on page 4-68. 5-27 (cid:127) (cid:127) If you get the overheat warning with no sign of steam, try this for a minute or so: 1. Turn on your heater to full hot at the highest fan speed and open the windows as necessary. 2. If you are in a traffic jam, shift to NEUTRAL (N); otherwise, shift to the highest gear while driving — DRIVE (D). If you no longer have the overheat warning, you can drive. Just to be safe, drive slower for about 10 minutes. If the warning does not come back on, you can drive normally. If the warning continues and you have not stopped, pull over, stop, and park your vehicle right away. If there is still no sign of steam, push down the accelerator until the engine speed is about twice as fast as normal idle speed for at least three minutes while you are parked. If you still have the warning, turn off the engine and get everyone out of the vehicle until it cools down. Also, see “Overheated Engine Protection Operating Mode” later in this section. You may decide not to lift the hood but to get service help right away. Overheated Engine Protection Operating Mode If an overheated engine condition exists and the REDUCED ENGINE POWER message is displayed, an overheat protection mode which alternates ﬁring groups of cylinders helps prevent engine damage. In this mode, you will notice a loss in power and engine performance. This operating mode allows your vehicle to be driven to a safe place in an emergency. Driving extended miles (km) and/or towing a trailer in the overheat protection mode should be avoided. Notice: After driving in the overheated engine protection operating mode, to avoid engine damage, allow the engine to cool before attempting any repair. The engine oil will be severely degraded. Repair the cause of coolant loss, change the oil and reset the oil life system. See Engine Oil on page 5-13. 5-28 Cooling System When you decide it is safe to lift the hood, here is what you will see: The coolant level should be at or above the FULL COLD mark. If it is not, you may have a leak at the pressure cap or in the radiator hoses, heater hoses, radiator, water pump or somewhere else in the cooling system. {CAUTION: Heater and radiator hoses, and other engine parts, can be very hot. Do not touch them. If you do, you can be burned. Do not run the engine if there is a leak. If you run the engine, it could lose all coolant. That could cause an engine ﬁre, and you could be burned. Get any leak ﬁxed before you drive the vehicle. A. Coolant Surge Tank B. Coolant Surge Tank Pressure Cap C. Engine Cooling Fan If the coolant inside the coolant surge tank is boiling, do not do anything else until it cools down. The vehicle should be parked on a level surface. If there seems to be no leak, start the engine again. The engine cooling fan speed should increase when idle speed is doubled by pushing the accelerator pedal down. If it does not, your vehicle needs service. Turn off the engine. 5-29 If no coolant is visible in the surge tank, add coolant as follows: {CAUTION: Steam and scalding liquids from a hot cooling system can blow out and burn you badly. They are under pressure, and if you turn the radiator pressure cap — even a little — they can come out at high speed. Never turn the cap when the cooling system, including the radiator pressure cap, is hot. Wait for the cooling system and radiator pressure cap to cool if you ever have to turn the pressure cap. Notice: Engine damage from running your engine without coolant is not covered by your warranty. See Overheated Engine Protection Operating Mode on page 5-28 for information on driving to a safe place in an emergency. Notice: Using coolant other than DEX-COOL® may cause premature engine, heater core or radiator corrosion. In addition, the engine coolant may require changing sooner, at 30,000 miles (50 000 km) or 24 months, whichever occurs ﬁrst. Any repairs would not be covered by your warranty. Always use DEX-COOL® (silicate-free) coolant in your vehicle. How to Add Coolant to the Coolant Surge Tank If you have not found a problem yet, check to see if coolant is visible in the surge tank. If coolant is visible but the coolant level is not at or above the FULL COLD mark, add a 50/50 mixture of clean, drinkable water and DEX-COOL® coolant at the coolant surge tank, but be sure the cooling system, including the coolant surge tank pressure cap, is cool before you do it. See Engine Coolant on page 5-24 for more information. 5-30 {CAUTION: {CAUTION: Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid such as alcohol, can boil before the proper coolant mixture will. Your vehicle’s coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, your engine could get too hot but you would not get the overheat warning. Your engine could catch ﬁre and you or others could be burned. Use a 50/50 mixture of clean, drinkable water and DEX-COOL® coolant. In cold weather, water can freeze and crack Notice: the engine, radiator, heater core and other parts. Use the recommended coolant and the proper coolant mixture. You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. 1. Locate the coolant surge tank pressure cap that has this label. 2. You can remove the coolant surge tank pressure cap when the cooling system, including the coolant surge tank pressure cap and upper radiator hose, are no longer hot. Turn the pressure cap slowly counterclockwise (left) about one full turn. If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left. 3. Then keep turning the pressure cap slowly, and remove it. 5-31 4. Fill the coolant surge tank with the proper mixture, to the FULL COLD mark. 5. With the coolant surge tank pressure cap off, start the engine and let it run until you can feel the upper radiator hose getting hot. Watch out for the engine cooling fan. By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper mixture to the coolant surge tank until the level reaches the FULL COLD mark. 6. Then replace the pressure cap. Be sure the pressure cap is hand-tight and fully seated. 5-32 Power Steering Fluid How to Check Power Steering Fluid Locate the cap with this symbol. See Engine Compartment Overview on page 5-12 for more information on location. See Engine Compartment Overview on page 5-12 for power steering ﬂuid reservoir location. When to Check Power Steering Fluid It is not necessary to regularly check power steering ﬂuid unless you suspect there is a leak in the system or you hear an unusual noise. A ﬂuid loss in this system could indicate a problem. Have the system inspected and repaired. To check the power steering ﬂuid, do the following: 1. Turn the key off and let the engine compartment cool down. 2. Wipe the cap and the top of the reservoir clean. 3. Unscrew the cap and wipe the dipstick with a clean rag. 4. Replace the cap and completely tighten it. 5. Remove the cap again and look at the ﬂuid level on the dipstick. The level should be at the FULL COLD mark. If necessary, add only enough ﬂuid to bring the level up to the mark. 5-33 What to Use To determine what kind of ﬂuid to use, see Recommended Fluids and Lubricants on page 6-12. Always use the proper ﬂuid. Failure to use the proper ﬂuid can cause leaks and damage hoses and seals. Windshield Washer Fluid What to Use When you need windshield washer ﬂuid, be sure to read the manufacturer’s instructions before use. If you will be operating your vehicle in an area where the temperature may fall below freezing, use a ﬂuid that has sufficient protection against freezing. Adding Washer Fluid Your vehicle has a low washer ﬂuid message that comes on when the washer ﬂuid is low. The message is displayed for 15 seconds at the start of each ignition cycle if the ﬂuid is low. When the LOW WASHER FLUID message is displayed, you will need to add washer ﬂuid to the windshield washer ﬂuid reservoir. Open the cap with the washer symbol on it. Add washer ﬂuid until the tank is full. See Engine Compartment Overview on page 5-12 for reservoir location. Notice: (cid:127) When using concentrated washer ﬂuid, follow the manufacturer’s instructions for adding water. (cid:127) Do not mix water with ready-to-use washer ﬂuid. Water can cause the solution to freeze and damage your washer ﬂuid tank and other parts of the washer system. Also, water does not clean as well as washer ﬂuid. Fill your washer ﬂuid tank only three-quarters full when it is very cold. This allows for expansion if freezing occurs, which could damage the tank if it is completely full. (cid:127) Do not use engine coolant (antifreeze) in your windshield washer. It can damage your washer system and paint. 5-34 (cid:127) Brakes Brake Fluid Your brake master cylinder reservoir is ﬁlled with DOT-3 brake ﬂuid. See Engine Compartment Overview on page 5-12 for the location of the reservoir. There are only two reasons why the brake ﬂuid level in the reservoir might go down. The ﬁrst is that the brake ﬂuid goes down to an acceptable level during normal brake lining wear. When new linings are put in, the ﬂuid level goes back up. The other reason is that ﬂuid is leaking out of the brake system. If it is, you should have your brake system ﬁxed, since a leak means that sooner or later your brakes will not work well, or will not work at all. So, it is not a good idea to top off your brake ﬂuid. Adding brake ﬂuid will not correct a leak. If you add ﬂuid when your linings are worn, then you will have too much ﬂuid when you get new brake linings. You should add or remove brake ﬂuid, as necessary, only when work is done on the brake hydraulic system. {CAUTION: If you have too much brake ﬂuid, it can spill on the engine. The ﬂuid will burn if the engine is hot enough. You or others could be burned, and your vehicle could be damaged. Add brake ﬂuid only when work is done on the brake hydraulic system. See “Checking Brake Fluid” in this section. Refer to the Maintenance Schedule to determine when to check your brake ﬂuid. See Scheduled Maintenance on page 6-4. 5-35 Checking Brake Fluid You can check the brake ﬂuid without taking off the cap. Always clean the brake ﬂuid reservoir cap and the area around the cap before removing it. This will help keep dirt from entering the reservoir. Just look at the brake ﬂuid reservoir. The ﬂuid level should be above MIN. If it is not, have your brake system checked to see if there is a leak. After work is done on the brake hydraulic system, make sure the level is above the MIN but not over the MAX mark. What to Add When you do need brake ﬂuid, use only DOT-3 brake ﬂuid. Use new brake ﬂuid from a sealed container only. See Recommended Fluids and Lubricants on page 6-12. 5-36 {CAUTION: With the wrong kind of ﬂuid in your brake system, your brakes may not work well, or they may not even work at all. This could cause a crash. Always use the proper brake ﬂuid. Notice: (cid:127) Using the wrong ﬂuid can badly damage brake system parts. For example, just a few drops of mineral-based oil, such as engine oil, in your brake system can damage brake system parts so badly that they will have to be replaced. Do not let someone put in the wrong kind of ﬂuid. If you spill brake ﬂuid on your vehicle’s painted surfaces, the paint ﬁnish can be damaged. Be careful not to spill brake ﬂuid on your vehicle. If you do, wash it off immediately. See Appearance Care on page 5-92. (cid:127) Brake Wear Your vehicle has four-wheel disc brakes. Disc brake pads have built-in wear indicators that make a high-pitched warning sound when the brake pads are worn and new pads are needed. The sound may come and go or be heard all the time your vehicle is moving, except when you are pushing on the brake pedal ﬁrmly. {CAUTION: The brake wear warning sound means that soon your brakes will not work well. That could lead to an accident. When you hear the brake wear warning sound, have your vehicle serviced. Notice: Continuing to drive with worn-out brake pads could result in costly brake repair. Some driving conditions or climates may cause a brake squeal when the brakes are ﬁrst applied or lightly applied. This does not mean something is wrong with your brakes. Properly torqued wheel nuts are necessary to help prevent brake pulsation. When tires are rotated, inspect brake pads for wear and evenly tighten wheel nuts in the proper sequence to GM torque speciﬁcations. Brake linings should always be replaced as complete axle sets. Brake Pedal Travel See your dealer if the brake pedal does not return to normal height, or if there is a rapid increase in pedal travel. This could be a sign of brake trouble. Brake Adjustment Every time you make a brake stop, your disc brakes adjust for wear. 5-37 Replacing Brake System Parts The braking system on a vehicle is complex. Its many parts have to be of top quality and work well together if the vehicle is to have really good braking. Your vehicle was designed and tested with top-quality GM brake parts. When you replace parts of your braking system — for example, when your brake linings wear down and you need new ones put in — be sure you get new approved GM replacement parts. If you do not, your brakes may no longer work properly. For example, if someone puts in brake linings that are wrong for your vehicle, the balance between your front and rear brakes can change — for the worse. The braking performance you have come to expect can change in many other ways if someone puts in the wrong replacement brake parts. Battery Your vehicle has a maintenance free battery. When it is time for a new battery, get one that has the replacement number shown on the original battery’s label. We recommend an ACDelco® replacement battery. See Engine Compartment Overview on page 5-12 for battery location. Warning: Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling. Vehicle Storage If you are not going to drive your vehicle for 25 days or more, remove the black, negative (−) cable from the battery. This will help keep your battery from running down. {CAUTION: Batteries have acid that can burn you and gas that can explode. You can be badly hurt if you are not careful. See Jump Starting on page 5-39 for tips on working around a battery without getting hurt. Also, for your audio system, see Theft-Deterrent Feature on page 3-89. 5-38 Jump Starting If your battery has run down, you may want to use another vehicle and some jumper cables to start your vehicle. Be sure to use the following steps to do it safely. {CAUTION: Batteries can hurt you. They can be dangerous because: (cid:127) They contain acid that can burn you. (cid:127) They contain gas that can explode (cid:127) They contain enough electricity to or ignite. burn you. If you do not follow these steps exactly, some or all of these things can hurt you. Ignoring these steps could result in costly Notice: damage to your vehicle that would not be covered by your warranty. Trying to start your vehicle by pushing or pulling it will not work, and it could damage your vehicle. 1. Check the other vehicle. It must have a 12-volt battery with a negative ground system. If the other vehicle’s system is not a 12-volt Notice: system with a negative ground, both vehicles can be damaged. Only use vehicles with 12-volt systems with negative grounds to jump start your vehicle. 2. Get the vehicles close enough so the jumper cables can reach, but be sure the vehicles are not touching each other. If they are, it could cause a ground connection you do not want. You would not be able to start your vehicle, and the bad grounding could damage the electrical systems. To avoid the possibility of the vehicles rolling, set the parking brake ﬁrmly on both vehicles involved in the jump start procedure. Put an automatic transmission in PARK (P) or a manual transmission in NEUTRAL before setting the parking brake. If you leave your radio or other accessories Notice: on during the jump starting procedure, they could be damaged. The repairs would not be covered by your warranty. Always turn off your radio and other accessories when jump starting your vehicle. 3. Turn off the ignition on both vehicles. Unplug unnecessary accessories plugged into the cigarette lighter or accessory power outlets. Turn off the radio and all lamps that are not needed. This will avoid sparks and help save both batteries. And it could save your radio! 5-39 4. Open the hoods and locate the positive (+) and negative (−) terminal locations of the other vehicle. Your vehicle has a remote positive (+) jump starting terminal and a remote negative (−) jump starting terminal. You should always use these remote terminals instead of the terminals on the battery. The remote positive (+) terminal is located near the engine accessory drive bracket. On some vehicles, the terminal may be covered by a red plastic cover. To access the remote positive (+) terminal, open the cover. The remote negative (−) terminal is located on the engine accessory drive bracket and is marked GND. See Engine Compartment Overview on page 5-12 for more information on the location of the remote terminals. 5-40 {CAUTION: Using a match near a battery can cause battery gas to explode. People have been hurt doing this, and some have been blinded. Use a ﬂashlight if you need more light. Be sure the battery has enough water. You do not need to add water to the battery installed in your new vehicle. But if a battery has ﬁller caps, be sure the right amount of ﬂuid is there. If it is low, add water to take care of that ﬁrst. If you do not, explosive gas could be present. Battery ﬂuid contains acid that can burn you. Do not get it on you. If you accidentally get it in your eyes or on your skin, ﬂush the place with water and get medical help immediately. 5. Check that the jumper cables do not have loose or missing insulation. If they do, you could get a shock. The vehicles could be damaged too. Before you connect the cables, here are some basic things you should know. Positive (+) will go to positive (+) or to a remote positive terminal (+) if the vehicle has one. Negative (−) will go to a heavy, unpainted metal engine part or to a remote negative (−) terminal, if the vehicle has one. Do not connect positive (+) to negative (−) or you will get a short that would damage the battery and maybe other parts too. {CAUTION: Fans or other moving engine parts can injure you badly. Keep your hands away from moving parts once the engine is running. 6. Connect the red positive (+) cable to the positive (+) terminal of the dead battery. Use a remote positive (+) terminal if the vehicle has one. 7. Do not let the other end touch metal. Connect it to the positive (+) terminal of the good battery. Use a remote positive (+) terminal if the vehicle has one. 5-41 8. Now connect the black negative (−) cable to the negative (−) terminal of the good battery. Use a remote negative (−) terminal if the vehicle has one. Do not let the other end touch anything until the next step. The other end of the negative (−) cable does not go to the dead battery. It goes to a heavy, unpainted metal engine part or to a remote negative (−) terminal on the vehicle with the dead battery. 9. Connect the other end of the negative (−) cable at least 18 inches (45 cm) away from the dead battery, but not near engine parts that move. The electrical connection is just as good there, and the chance of sparks getting back to the battery is much less. Use a remote negative (−) terminal if the vehicle has one. Your vehicle’s remote negative (−) terminal is marked GND. 10. Now start the vehicle with the good battery and run the engine for awhile. 11. Try to start the vehicle that had the dead battery. If it will not start after a few tries, it probably needs service. 5-42 If the jumper cables are removed in the Notice: wrong order, electrical shorting may occur and damage the vehicle. The repairs would not be covered by your warranty. Remove the jumper cables in the correct order, making sure that the cables do not touch each other or other metal. Jumper Cable Removal A. Heavy, Unpainted Metal Engine Part or Remote Negative (−) Terminal B. Good Battery or Remote Positive (+) and Negative (−) Terminals C. Dead Battery or Remote Positive (+) Terminal To disconnect the jumper cables from both vehicles do the following: 1. Disconnect the black negative (−) cable from the vehicle that had the dead battery. 2. Disconnect the black negative (−) cable from the vehicle with the good battery. 3. Disconnect the red positive (+) cable from the vehicle with the good battery. 4. Disconnect the red positive (+) cable from the other vehicle. 5. Return the positive (+) remote terminal cover to its original position. All-Wheel Drive Transfer Case It is not necessary to regularly check transfer case ﬂuid unless you suspect there is a leak or you hear an unusual noise. A ﬂuid loss could indicate a problem. Have it inspected and repaired. Refer to the Maintenance Schedule to determine how often to change the lubricant. See Scheduled Maintenance on page 6-4. How to Check Lubricant A. Filler Plug B. Drain Plug 1. Remove the ﬁller plug (A). The ﬂuid level should be just below the bottom of the ﬁller plug hole. To get an accurate reading, the vehicle should be on a level surface. 2. Add ﬂuid if necessary. Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Recommended Fluids and Lubricants on page 6-12. 3. Reinstall the ﬁller plug. Use care not to overtighten the ﬁller plug. 5-43 Rear Axle When to Check Lubricant It is not necessary to regularly check rear axle ﬂuid unless you suspect there is a leak or you hear an unusual noise. A ﬂuid loss could indicate a problem. Have it inspected and repaired. How to Check Lubricant When the differential is cold, the proper level is from 5/8 inch to 1-5/8 inch (15 mm to 40 mm) below the bottom of the ﬁller plug hole. Add only enough ﬂuid to reach the proper level. What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Recommended Fluids and Lubricants on page 6-12. Front Axle When to Check and Change Lubricant It is not necessary to regularly check front axle ﬂuid unless you suspect there is a leak or you hear an unusual noise. A ﬂuid loss could indicate a problem. Have it inspected and repaired. To get an accurate reading, the vehicle should be on a level surface. 5-44 How to Check Lubricant What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Recommended Fluids and Lubricants on page 6-12. Bulb Replacement See Replacement Bulbs on page 5-52 for the proper type of bulb to use. For any bulb changing procedure not listed in this section, contact your dealer. Halogen Bulbs {CAUTION: To get an accurate reading, the vehicle should be on a level surface. When the differential is cold, the proper level is from about 1/4 inch (6 mm) to about 3/8 inch (10 mm) below the ﬁller plug hole. Halogen bulbs have pressurized gas inside and can burst if you drop or scratch the bulb. You or others could be injured. Be sure to read and follow the instructions on the bulb package. 5-45 4. Unplug the electrical connector. 5. Push the new bulb/socket into the headlamp assembly making sure to align the splines on the bulb/socket with the splines in the headlamp housing. Use care not to touch the bulb with your ﬁngers or hands. 6. Turn the bulb/socket retainer clockwise to lock the bulb/socket in place. 7. Plug in the electrical connector. Headlamps 1. Open the hood as described earlier under Hood Release on page 5-10 and locate the affected headlamp on the inner front portion of the hood. 2. Turn the bulb/socket retainer counterclockwise to unlock the bulb/socket. You may prefer to unplug the electrical connector before removing the bulb/socket. If so, complete Step 4 before doing this step. 3. Pull the bulb/socket straight out from the headlamp housing. 5-46 Front Turn Signal and Parking Lamps 1. Open the hood as described earlier under Hood Release on page 5-10 and locate the affected lamp. 2. Turn the bulb socket counterclockwise and remove it from the lamp housing. Daytime Running Lamps 1. Locate the lamp assembly behind the front bumper. It is easiest to come in from the side of the vehicle through the wheel opening. 3. Pull the bulb from the bulb socket. 4. Put the new bulb into the bulb socket. 5. Put the bulb socket into the lamp housing and turn it clockwise until it locks. 5-47 2. Turn the bulb socket counterclockwise and remove it from the lamp housing. Roof Marker Lamps Corner Roof Marker Lamps 3. Remove the bulb from the bulb socket. 4. Put the new bulb into the bulb socket. 5. Put the bulb socket into the lamp housing and turn it clockwise until it locks. 1. Remove the screw and lift off the lens. 5-48 Center Roof Marker Lamps 1. Push in on the notch with a ﬂat tool and pull the lamp out. 2. Turn the socket counterclockwise to remove it and remove the old bulb. 3. Put a new bulb into the socket. 4. Reinstall the socket into the lens and turn it clockwise to lock it into place. 5. Hook the side of the lens with the hook end in the notch ﬁrst and then tighten the screw. 5-49 Taillamps A. Stoplamp B. Turn Signal Lamp C. Back-Up Lamp 2. Turn the bulb socket counterclockwise and remove it from the lamp housing. 3. Remove the bulb from the bulb socket. 4. Put the new bulb into the bulb socket. 5. Place the hook end of the lamp in place on one side and push the other end of the lamp down until it locks in place. 1. Open the liftgate or tailgate. 5-50 2. Remove the two screws from the rear lamp assembly and remove the rear lamp assembly. 4. Pull the bulb straight out from the socket. 3. Turn the bulb socket counterclockwise to remove it from the taillamp housing. 5. Press a new bulb into the socket, insert it into the taillamp housing and turn the socket counterclockwise until it is locked in place. 6. Reinstall the rear lamp assembly and tighten the screws. Your vehicle may have a taillamp in the bumper. To replace it, do the following: 5-51 Replacement Bulbs Exterior Lamp Back-up Lamp Daytime Running Lamp (DRL) Front Turn Signal and Parking Lamp Low-Beam and High-Beam Headlamps Rear Taillamp and Stoplamp Rear Taillamp in Bumper Rear Turn Signal Lamp Roof Marker Lamp Bulb Number 3156 4114K 4157K or 3157KX 9007 3057 3057 3156 168 For replacement bulbs not listed here, please consult your dealer. 1. Locate the affected taillamp which is behind and under the bumper. 2. Turn the bulb socket counterclockwise and remove it from the lamp housing. 3. Remove the bulb from the bulb socket. 4. Put the new bulb into the bulb socket. 5. Put the bulb socket into the lamp housing and turn it clockwise to lock it. 5-52 Windshield Wiper Blade Replacement Windshield wiper blades should be inspected at least twice a year for wear and cracking. See Scheduled Maintenance on page 6-4 for more information. Replacement blades come in different types and are removed in different ways. For proper type and length, see Normal Maintenance Replacement Parts on page 6-13. To replace the windshield wiper blade assembly do the following: 1. Lift the wiper arm and turn the blade until it is facing away from the windshield. 2. Push the release lever and slide the wiper assembly toward the driver’s side of the vehicle. 3. Install a new blade by reversing Steps 1 and 2. 5-53 CAUTION: (Continued) (cid:127) Underinﬂated tires pose the same danger as overloaded tires. The resulting accident could cause serious injury. Check all tires frequently to maintain the recommended pressure. Tire pressure should be checked when your tires are cold. See Inﬂation - Tire Pressure on page 5-60. (cid:127) Overinﬂated tires are more likely to be cut, punctured or broken by a sudden impact — such as when you hit a pothole. Keep tires at the recommended pressure. (cid:127) Worn, old tires can cause accidents. If your tread is badly worn, or if your tires have been damaged, replace them. Tires Your new vehicle comes with high-quality tires made by a leading tire manufacturer. If you ever have questions about your tire warranty and where to obtain service, see your GM Warranty booklet for details. For additional information refer to the tire manufacturer’s booklet included with your vehicle’s Owner’s Manual. {CAUTION: Poorly maintained and improperly used tires are dangerous. (cid:127) Overloading your tires can cause overheating as a result of too much friction. You could have an air-out and a serious accident. See Loading Your Vehicle on page 4-58. CAUTION: (Continued) 5-54 Tire Sidewall Labelling Useful information about a tire is molded into the sidewall. The following illustrations are examples of a typical P-Metric and a LT-Metric tire sidewall. Passenger (P-Metric) Tire (A) Tire Size: The tire size code is a combination of letters and numbers used to deﬁne a particular tire’s width, height, aspect ratio, construction type and service description. See the “Tire Size” illustration later in this section for more detail. (B) TPC Spec (Tire Performance Criteria Speciﬁcation): Original equipment tires designed to GM’s speciﬁc tire performance criteria have a TPC speciﬁcation code molded onto the sidewall. GM’s TPC speciﬁcations meet or exceed all federal safety guidelines. (C) DOT (Department of Transportation): The Department of Transportation (DOT) code indicates that the tire is in compliance with the U.S. Department of Transportation Motor Vehicle Safety Standards. (D) Tire Identiﬁcation Number (TIN): The letters and numbers following DOT code are the Tire Identiﬁcation Number (TIN). The TIN shows the manufacturer and plant code, tire size, and date the tire was manufactured. The TIN is molded onto both sides of the tire, although only one side may have the date of manufacture. (E) Tire Ply Material: The type of cord and number of plies in the sidewall and under the tread. (F) Uniform Tire Quality Grading (UTQG): Tire manufacturers are required to grade tires based on three performance factors: treadwear, traction and temperature resistance. For more information, see Uniform Tire Quality Grading on page 5-64. (G) Maximum Cold Inﬂation Load Limit: Maximum load that can be carried and the maximum pressure needed to support that load. For information on recommended tire pressure see Inﬂation - Tire Pressure on page 5-60 and Loading Your Vehicle on page 4-58. 5-55 speciﬁcation code molded onto the sidewall. GM’s TPC speciﬁcations meet or exceed all federal safety guidelines. (C) Dual Tire Maximum Load: Maximum load that can be carried and the maximum pressure needed to support that load when used in a dual conﬁguration. For information on recommended tire pressure see Inﬂation - Tire Pressure on page 5-60 and Loading Your Vehicle on page 4-58. (D) DOT (Department of Transportation): The Department of Transportation (DOT) code indicates that the tire is in compliance with the U.S. Department of Transportation Motor Vehicle Safety Standards. (E) Tire Identiﬁcation Number (TIN): The letters and numbers following DOT code are the Tire Identiﬁcation Number (TIN). The TIN shows the manufacturer and plant code, tire size, and date the tire was manufactured. The TIN is molded onto both sides of the tire, although only one side may have the date of manufacture. (F) Tire Ply Material: The type of cord and number of plies in the sidewall and under the tread. (G) Single Tire Maximum Load: Maximum load that can be carried and the maximum pressure needed to support that load when used as a single. For information on recommended tire pressure see Inﬂation - Tire Pressure on page 5-60 and Loading Your Vehicle on page 4-58. Light Truck (LT-Metric) Tire (A) Tire Size: The tire size code is a combination of letters and numbers used to deﬁne a particular tire’s width, height, aspect ratio, construction type and service description. See the “Tire Size” illustration later in this section for more detail. (B) TPC Spec (Tire Performance Criteria Speciﬁcation): Original equipment tires designed to GM’s speciﬁc tire performance criteria have a TPC 5-56 Tire Size The following examples show the different parts of a tire size. Passenger (P-Metric) Tire Light Truck (LT-Metric) Tire (A) Passenger (P-Metric) Tire: The United States version of a metric tire sizing system. The letter P as the ﬁrst character in the tire size means a passenger vehicle tire engineered to standards set by the U.S. Tire and Rim Association. (A) Light Truck (LT-Metric) Tire: The United States version of a metric tire sizing system. The letters LT as the ﬁrst two characters in the tire size means a light truck tire engineered to standards set by the U. S. Tire and Rim Association. (B) Tire Width: The three-digit number indicates the tire section width in millimeters from sidewall to sidewall. (C) Aspect Ratio: A two-digit number that indicates the tire height-to-width measurements. For example, if the tire size aspect ratio is 75, as shown in item C of the light truck (LT-Metric) tire illustration, it would mean that the tire’s sidewall is 75% as high as it is wide. (D) Construction Code: A letter code is used to indicate the type of ply construction in the tire. The letter R means radial ply construction; the letter D means diagonal or bias ply construction; and the letter B means belted-bias ply construction. (E) Rim Diameter: Diameter of the wheel in inches. (F) Service Description: The service description indicates the load range and speed rating of a tire. The load index can range from 1 to 279. Speed ratings range from A to Z. 5-57 Tire Terminology and Deﬁnitions Air Pressure: The amount of air inside the tire pressing outward on each square inch of the tire. Air pressure is expressed in pounds per square inch (psi) or kilopascal (kPa). Accessory Weight: This means the combined weight of optional accessories. Some examples of optional accessories are, automatic transmission, power steering, power brakes, power windows, power seats, and air conditioning. Aspect Ratio: The relationship of a tire’s height to its width. Belt: A rubber coated layer of cords that is located between the plies and the tread. Cords may be made from steel or other reinforcing materials. Bead: The tire bead contains steel wires wrapped by steel cords that hold the tire onto the rim. Bias Ply Tire: A pneumatic tire in which the plies are laid at alternate angles less than 90 degrees to the centerline of the tread. Cold Inﬂation Pressure: The amount of air pressure in a tire, measured in pounds per square inch (psi) or kilopascals (kPa) before a tire has built up heat from driving. See Inﬂation - Tire Pressure on page 5-60. 5-58 Curb Weight: This means the weight of a motor vehicle with standard and optional equipment including the maximum capacity of fuel, oil and coolant, but without passengers and cargo. DOT Markings: A code molded into the sidewall of a tire signifying that the tire is in compliance with the U.S. Department of Transportation (DOT) motor vehicle safety standards. The DOT code includes the Tire Identiﬁcation Number (TIN), an alphanumeric designator which can also identify the tire manufacturer, production plant, brand and date of production. GVWR: Gross Vehicle Weight Rating, see Loading Your Vehicle on page 4-58. GAWR FRT: Gross Axle Weight Rating for the front axle, see Loading Your Vehicle on page 4-58. GAWR RR: Gross Axle Weight Rating for the rear axle, see Loading Your Vehicle on page 4-58. Intended Outboard Sidewall: The side of an asymmetrical tire, that must always face outward when mounted on a vehicle. KiloPascal (kPa): The metric unit for air pressure. Light Truck (LT-Metric) Tire: A tire used on light duty trucks and some multipurpose passenger vehicles. Load Index: An assigned number ranging from 1 to 279 that corresponds to the load carrying capacity of a tire. Maximum Inﬂation Pressure: The maximum air pressure to which a cold tire may be inﬂated. The maximum air pressure is molded onto the sidewall. Maximum Load Rating: The load rating for a tire at the maximum permissible inﬂation pressure for that tire. Maximum Loaded Vehicle Weight: The sum of curb weight; accessory weight; vehicle capacity weight; and production options weight. Normal Occupant Weight: The number of occupants a vehicle is designed to seat multiplied by 150 lbs (68 kg). See Loading Your Vehicle on page 4-58. Occupant Distribution: Designated seating positions. Outward Facing Sidewall: The side of an asymmetrical tire that has a particular side that faces outward when mounted on a vehicle. The side of the tire that contains a whitewall, bears white lettering or bears manufacturer, brand, and/or model name molding that is higher or deeper than the same moldings on the other sidewall of the tire. Passenger (P-Metric) Tire: A tire used on passenger cars and some light duty trucks and multipurpose vehicles. Recommended Inﬂation Pressure: Vehicle manufacturer’s recommended tire inﬂation pressure and shown on the tire placard. See Inﬂation - Tire Pressure on page 5-60 and Loading Your Vehicle on page 4-58. Radial Ply Tire: A pneumatic tire in which the ply cords that extend to the beads are laid at 90 degrees to the centerline of the tread. Rim: A metal support for a tire and upon which the tire beads are seated. Sidewall: The portion of a tire between the tread and the bead. Speed Rating: An alphanumeric code assigned to a tire indicating the maximum speed at which a tire can operate. Traction: The friction between the tire and the road surface. The amount of grip provided. Tread: The portion of a tire that comes into contact with the road. 5-59 Treadwear Indicators: Narrow bands, sometimes called “wear bars,” that show across the tread of a tire when only 1/16 inch (1.6 mm) of tread remains. See When It Is Time for New Tires on page 5-63. UTQGS (Uniform Tire Quality Grading Standards): A tire information system that provides consumers with ratings for a tire’s traction, temperature, and treadwear. Ratings are determined by tire manufacturers using government testing procedures. The ratings are molded into the sidewall of the tire. See Uniform Tire Quality Grading on page 5-64. Vehicle Capacity Weight: The number of designated seating positions multiplied by 150 lbs. (68 kg) plus the rated cargo load. See Loading Your Vehicle on page 4-58. Vehicle Maximum Load on the Tire: Load on an individual tire due to curb weight, accessory weight, occupant weight, and cargo weight. Vehicle Placard: A label permanently attached to a vehicle showing the original equipment tire size and recommended inﬂation pressure. See Loading Your Vehicle on page 4-58. Inﬂation - Tire Pressure Tires need the correct amount of air pressure to operate effectively. Notice: Do not let anyone tell you that under-inﬂation or over-inﬂation is all right. It is not. If your tires do not have enough air (under-inﬂation), you can get the following: Too much ﬂexing Too much heat Tire overloading (cid:127) Premature or irregular wear (cid:127) Poor handling (cid:127) Reduced fuel economy If your tires have too much air (over-inﬂation), you can get the following: (cid:127) Unusual wear (cid:127) Poor handling (cid:127) Rough ride (cid:127) Needless damage from road hazards 5-60 (cid:127) (cid:127) (cid:127) A Tire and Loading Information label is attached to the vehicle’s center pillar (B-pillar), below the driver’s door latch. This label shows your vehicle’s original equipment tires and the correct inﬂation pressures for your tires when they are cold. The recommended cold tire inﬂation pressure, shown on the label, is the minimum amount of air pressure needed to support your vehicle’s maximum load carrying capacity. For additional information regarding how much weight your vehicle can carry, and an example of the tire and loading information label, see Loading Your Vehicle on page 4-58. How you load your vehicle affects vehicle handling and ride comfort, never load your vehicle with more weight than it was designed to carry.

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2005 Hummer H2 Owners Manual