2006 Hummer H2 Owners Manual

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the shift lever in PARK (P). 4. 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. 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. Consistency of Readings Always check the ﬂuid level at least twice using the procedure described previously. Consistency (repeatable readings) is important to maintaining proper ﬂuid level. If inconsistent readings persist, check the transmission breather hose to be sure it is clean and unclogged. If readings are still inconsistent, contact your dealer. 5-23 How to Add Automatic Transmission 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 the incorrect automatic transmission ﬂuid may damage your vehicle, and the damages may not be covered by your warranty. Always use the automatic transmission ﬂuid listed in Recommended Fluids and Lubricants on page 6-12. (cid:127) After adding ﬂuid, recheck the ﬂuid level as described under “How to Check Automatic Transmission Fluid,” 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. 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 ﬁve 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 5-27. 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 the ﬁrst maintenance service after each 25,000 miles (41 500 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 (cid:127) What Kind of Coolant 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. If you have to add coolant more than four times a year, have your dealer check your cooling system. Notice: in your vehicle’s cooling system, you could damage your vehicle. Use only the proper mixture of the engine coolant listed in this manual for the cooling system. See Recommended Fluids and Lubricants on page 6-12 for more information. If you use extra inhibitors and/or additives 5-25 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. 5-26 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 and fully seated. Coolant Surge Tank Pressure Cap Notice: If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. 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. Engine Overheating You will ﬁnd a coolant temperature gage on your vehicle’s instrument panel. See Engine Coolant Temperature Gage on page 3-37. 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 3-48. 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. CAUTION: (Continued) CAUTION: (Continued) 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. 5-27 If No Steam Is Coming From Your Engine The ENGINE COOLANT HOT message, 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 4-63. If you get the ENGINE COOLANT HOT message 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. 5-28 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 5-14. (cid:127) (cid:127) Cooling System When you decide it is safe to lift the hood, here is what you will see: 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. Check the coolant level after the system cools down. Some amount of coolant may be lost due to overheating. 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. 5-29 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. 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. 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. 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 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 See Engine Compartment Overview on page 5-12 for 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. How to Check Power Steering Fluid 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. 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. 5-33 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 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 CHECK WASHER FLUID message is displayed, you will need to add washer ﬂuid to the windshield washer ﬂuid reservoir. See DIC Warnings and Messages on page 3-48 for more information. 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. 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. 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. 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 Washing Your Vehicle on page 5-109. (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 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. 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. 5-38 Jump Starting If your vehicle’s 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, if equipped. The remote negative (−) terminal is located on the engine accessory drive bracket and is marked GND (Ground). 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. 5-41 If the jumper cables are connected or Notice: removed in the wrong order, electrical shorting may occur and damage the vehicle. The repairs would not be covered by your warranty. Always connect and remove the jumper cables in the correct order, making sure that the cables do not touch each other or other metal. 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. 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. 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 5-42 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, if equipped, to its original position. 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. All axle assemblies are ﬁlled by volume of ﬂuid during production. They are not ﬁlled to reach a certain level. When checking the ﬂuid level on any axle, variations in the readings can be caused by factory ﬁll differences between the minimum and the maximum ﬂuid volume. Also, if a vehicle has just been driven before checking the ﬂuid level, it may appear lower than normal because ﬂuid has traveled out along the axle tubes and has not drained back to the sump area. Therefore, a reading taken ﬁve minutes after the vehicle has been driven will appear to have a lower ﬂuid level than a vehicle that has been stationary for an hour or two. Remember that the rear axle assembly must be supported to get a true reading. 5-43 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. Four-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 To get an accurate reading, the vehicle should be on a level surface. 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, located on the rear axle. Add only enough ﬂuid to reach the proper level. 5-44 How to Check Lubricant 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. 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. 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 located on the transfer case. To get an accurate reading, the vehicle should be on a level surface. 5-45 Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 5-51. For any bulb changing procedure not listed in this section, contact your dealer. Halogen Bulbs {CAUTION: 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. How to Check Lubricant 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. 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. 5-46 Headlamps To replace a headlamp bulb, do the following: 1. Open the hood. See Hood Release on page 5-11 for more information. 2. Locate the affected headlamp on the inner front portion of the hood. 3. 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 5 before doing this step. 4. Pull the bulb/socket straight out from the headlamp housing. 5. Unplug the electrical connector. 6. 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. 7. Turn the bulb socket retainer clockwise to lock it into place. 8. Plug in the electrical connector. 5-47 Front Turn Signal and Parking Lamps To replace a front turn signal or parking lamp bulb, do the following: 1. Open the hood. See Hood Release on page 5-11 for more information. 2. Locate the bulb you need to change. 3. Turn the bulb socket counterclockwise and remove it from the lamp housing. Daytime Running Lamps (DRL) To replace a daytime running lamp bulb, do the following: 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. 2. Turn the bulb socket counterclockwise and remove it from the lamp housing. 3. Remove the bulb from the bulb socket. 4. Install the new bulb into the bulb socket. 5. Reinstall the bulb socket into the lamp housing and turn it clockwise until it locks. 4. Pull the bulb from the bulb socket. 5. Install the new bulb into the bulb socket. 6. Reinstall the bulb socket into the lamp housing and turn it clockwise until it locks. 5-48 Roof Marker Lamps Corner Roof Marker Lamps To replace one of these bulbs, do the following: Center Roof Marker Lamps To replace one of these bulbs, do the following: 1. Remove the screw and lift off the lens. 2. Turn the bulb socket counterclockwise to remove it. 3. Remove the bulb. 4. Install a new bulb into the socket. 5. Reinstall the socket into the lens and turn it clockwise to lock it into place. 6. Hook the side of the lens with the hook end into the notch ﬁrst and then tighten the screw. 1. Push in on the notch with a ﬂat tool and pull the lamp out. 2. Turn the bulb socket counterclockwise and remove it from the lamp housing. 3. Remove the bulb from the bulb socket. 4. Install a 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. 5-49 Taillamps, Turn Signal, Stoplamps and Back-up Lamps A. Stoplamp/Taillamp B. Turn Signal Lamp C. Back-Up Lamp 3. Remove the two screws from the rear lamp assembly and remove the rear lamp assembly. To replace one of these bulbs, do the following: 1. Open the liftgate or tailgate. See Liftgate (SUV) on page 2-11 or Tailgate/Spare Tire Carrier on page 2-14 for more information. 2. If your vehicle is equipped with a taillamp guard, you will need to remove it in order to access the taillamp. To do this, remove the four screws retaining the taillamp guard making sure not to remove the plastic retainers. 5-50 4. Turn the bulb socket counterclockwise to remove it from the taillamp housing. 5. Pull the bulb straight out from the socket. 6. Press a new bulb into the socket, insert it into the taillamp housing and turn the socket counterclockwise until it is locked in place. 7. Reinstall the rear lamp assembly and tighten the screws. 8. Reinstall the taillamp guard by lining up the guard with the holes in vehicle. Then install and tighten the four screws. Your vehicle may have a taillamp in the bumper. To replace it, do the following: 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. Install the new bulb into the bulb socket. 5. Reinstall the bulb socket into the lamp housing and turn it clockwise to lock it. Replacement Bulbs Exterior Lamp Bulb Number 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 3156 4114K 4157K or 3157KX 9007 3057 3057 3156 168 For replacement bulbs not listed here, contact your dealer. 5-51 Windshield Wiper Blade Replacement Windshield wiper blades should be inspected 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 6-14. 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. 5-52 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. 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 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 4-55. 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 5-59. (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. CAUTION: (Continued) 5-53 Tire Sidewall Labeling 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. 5-54 (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 5-65. (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 5-59 and Loading Your Vehicle on page 4-55. TPC 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 5-59 and Loading Your Vehicle on page 4-55. (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 5-59 and Loading Your Vehicle on page 4-55. 5-55 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 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. 5-56 (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. 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 5-59. 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 4-55. GAWR FRT: Gross Axle Weight Rating for the front axle, see Loading Your Vehicle on page 4-55. GAWR RR: Gross Axle Weight Rating for the rear axle, see Loading Your Vehicle on page 4-55. 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. 5-57 Load Index: An assigned number ranging from 1 to 279 that corresponds to the load carrying capacity of a tire. Passenger (P-Metric) Tire: A tire used on passenger cars and some light duty trucks and multipurpose vehicles. 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 4-55. 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. Recommended Inﬂation Pressure: Vehicle manufacturer’s recommended tire inﬂation pressure and shown on the tire placard. See Inﬂation - Tire Pressure on page 5-59 and Loading Your Vehicle on page 4-55. 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. 5-58 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 5-62. 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 5-65. 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 4-55. 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 vehicle’s capacity weight and the original equipment tire size and recommended inﬂation pressure. See “Tire and Loading Information Label” under Loading Your Vehicle on page 4-55. 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 5-59 (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 4-55. How you load your vehicle affects vehicle handling and ride comfort, never load your vehicle with more weight than it was designed to carry. When to Check Check your tires once a month or more. Also, check the tire pressure of the spare tire. How to Check Use a good quality pocket-type gage to check tire pressure. You cannot tell if your tires are properly inﬂated simply by looking at them. Radial tires may look properly inﬂated even when they’re underinﬂated. Check the tire’s inﬂation pressure when the tires are cold. Cold means your vehicle has been sitting for at least three hours or driven no more than 1 mile (1.6 km). Remove the valve cap from the tire valve stem. Press the tire gage ﬁrmly onto the valve to get a pressure measurement. If the cold tire inﬂation pressure matches the recommended pressure on the tire and loading information label, no further adjustment is necessary. If the pressure is low, add air until you reach the recommended amount. If you overﬁll the tire, release air by pushing on the metal stem in the center of the tire valve. Recheck the tire pressure with the tire gage. Be sure to put the valve caps back on the valve stems. They help prevent leaks by keeping out dirt and moisture. 5-60 Tire Inspection and Rotation Tires should be rotated every 5,000 to 8,000 miles (8 000 to 13 000 km). Any time you notice unusual wear, rotate your tires as soon as possible and check wheel alignment. Also check for damaged tires or wheels. See When It Is Time for New Tires on page 5-62 and Wheel Replacement on page 5-66 for more information. Make sure the spare tire is stored securely. Push, pull, and then try to rotate or turn the tire. If it moves, use the ratchet/wheel wrench to tighten the wheel nuts. See Changing a Flat Tire on page 5-70. The purpose of regular rotation is to achieve more uniform wear for all tires on the vehicle. The ﬁrst rotation is the most important. See Scheduled Maintenance on page 6-4. Five-Tire Rotation Pattern When rotating your vehicle’s tires, always use one of the correct rotation pattern shown here. The ﬁve-tire rotation pattern includes a full-size spare tire and wheel assembly that matches the regular road tires and wheels in size, type, and brand. Four-Tire Rotation Pattern 5-61 After the tires have been rotated, adjust the front and rear inﬂation pressures as shown on the tire and loading information label. See Loading Your Vehicle on page 4-55 and Inﬂation - Tire Pressure on page 5-59, for more information. Make certain that all wheel nuts are properly tightened. See “Wheel Nut Torque” under Capacities and Speciﬁcations on page 5-124. {CAUTION: Rust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after a time. The wheel could come off and cause an accident. When you change a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, you can use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if needed, to get all the rust or dirt off. See Changing a Flat Tire on page 5-70. 5-62 When It Is Time for New Tires One way to tell when it is time for new tires is to check the treadwear indicators, which will appear when your tires have only 1/16 inch (1.6 mm) or less of tread remaining. Some commercial truck tires may not have treadwear indicators. You need a new tire if any of the following statements are true: (cid:127) You can see the indicators at three or more places around the tire. (cid:127) You can see cord or fabric showing through the tire’s rubber. The tread or sidewall is cracked, cut or snagged deep enough to show cord or fabric. The tire has a bump, bulge, or split. The tire has a puncture, cut, or other damage that cannot be repaired well because of the size or location of the damage. (cid:127) (cid:127) (cid:127) Buying New Tires GM has developed and matched speciﬁc tires for your vehicle. The original equipment tires installed on your vehicle, when it was new, were designed to meet General Motors Tire Performance Criteria Speciﬁcation (TPC spec) system rating. If you need replacement tires, GM strongly recommends that you get tires with the same TPC Spec rating. This way, your vehicle will continue to have tires that are designed to give the same performance and vehicle safety, during normal use, as the original tires. GM’s exclusive TPC Spec system considers over a dozen critical speciﬁcations that impact the overall performance of your vehicle, including brake system performance, ride and handling, traction control, and tire pressure monitoring performance. GM’s TPC Spec number is molded onto the tire’s sidewall by the tire manufacturer. If the tires have an all-season tread design, the TPC spec number will be followed by a MS, for mud and snow. See Tire Sidewall Labeling on page 5-54 for additional information. {CAUTION: Mixing tires could cause you to lose control while driving. If you mix tires of different sizes, brands, or types (radial and bias-belted tires) the vehicle may not handle properly, and you could have a crash. Using tires of different sizes, brands, or types may also cause damage to your vehicle. Be sure to use the correct size, brand, and type of tires on your vehicle’s wheels. 5-63 {CAUTION: If you use bias-ply tires on your vehicle, the wheel rim ﬂanges could develop cracks after many miles of driving. A tire and/or wheel could fail suddenly, causing a crash. Use only radial-ply tires with the wheels on your vehicle. If you must replace your vehicle’s tires with those that do not have a TPC Spec number, make sure they are the same size, load range, speed rating, and construction type (radial and bias-belted tires) as your vehicle’s original tires. Your vehicle’s original equipment tires are listed on the Tire and Loading Information Label. This label is attached to the vehicle’s center pillar (B-pillar). See Loading Your Vehicle on page 4-55, for more information about the Tire and Loading Information Label. 5-64 Different Size Tires and Wheels If you add wheels or tires that are a different size than your original equipment wheels and tires, this may affect the way your vehicle performs, including its braking, ride and handling characteristics, stability and resistance to rollover. Additionally, if your vehicle has electronic systems such as, antilock brakes; traction control; and electronic stability control, the performance of these systems can be affected. {CAUTION: If you add different sized wheels, your vehicle may not provide an acceptable level of performance and safety if tires not recommended for those wheels are selected. You may increase the chance that you will crash and suffer serious injury. Only use GM speciﬁc wheel and tire systems developed for your vehicle, and have them properly installed by a GM certiﬁed technician. See Buying New Tires on page 5-63 and Accessories and Modiﬁcations on page 5-3 for additional information. Uniform Tire Quality Grading Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width. For example: Treadwear 200 Traction AA Temperature A The following information relates to the system developed by the United States National Highway Traffic Safety Administration, which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold in the United States.) The grades are molded on the sidewalls of most passenger car tires. The Uniform Tire Quality Grading system does not apply to deep tread, winter-type snow tires, space-saver or temporary use spare tires, tires with nominal rim diameters of 10 to 12 inches (25 to 30 cm), or to some limited-production tires. While the tires available on General Motors passenger cars and light trucks may vary with respect to these grades, they must also conform to federal safety requirements and additional General Motors Tire Performance Criteria (TPC) standards. Treadwear The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a speciﬁed government test course. For example, a tire graded 150 would wear one and a half (1.5) times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart signiﬁcantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate. Traction – AA, A, B, C The traction grades, from highest to lowest, are AA, A, B, and C. Those grades represent the tire’s ability to stop on wet pavement as measured under controlled conditions on speciﬁed government test surfaces of asphalt and concrete. A tire marked C may have poor traction performance. Warning: The traction grade assigned to this tire is based on straight-ahead braking traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics. 5-65 Temperature – A, B, C The temperature grades are A (the highest), B, and C, representing the tire’s resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a speciﬁed indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. The grade C corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law. Warning: The temperature grade for this tire is established for a tire that is properly inﬂated and not overloaded. Excessive speed, underinﬂation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire failure. Wheel Alignment and Tire Balance The tires and wheels on your vehicle were aligned and balanced carefully at the factory to give you the longest tire life and best overall performance. Adjustments to wheel alignment and tire balancing will not be necessary on a regular basis. However, if you notice unusual tire wear or your vehicle pulling to one side or the other, the alignment may need to be checked. If you notice your vehicle vibrating when driving on a smooth road, your tires and wheels may need to be rebalanced. See your dealer for proper diagnosis. Wheel Replacement Replace any wheel that is bent, cracked or badly rusted or corroded. If wheel nuts keep coming loose, the wheel, wheel bolts and wheel nuts should be replaced. If the wheel leaks air, replace it (except some aluminum wheels, which can sometimes be repaired). See your dealer if any of these conditions exist. Your dealer will know the kind of wheel you need. Each new wheel should have the same load-carrying capacity, diameter, width, offset and be mounted the same way as the one it replaces. 5-66 If you need to replace any of your wheels, wheel bolts or wheel nuts, replace them only with new GM original equipment parts. This way, you will be sure to have the right wheel, wheel bolts and wheel nuts for your vehicle. Used Replacement Wheels {CAUTION: {CAUTION: Using the wrong replacement wheels, wheel bolts, or wheel nuts on your vehicle can be dangerous. It could affect the braking and handling of your vehicle, make your tires lose air and make you lose control. You could have a collision in which you or others could be injured. Always use the correct wheel, wheel bolts and wheel nuts for replacement. Notice: The wrong wheel can also cause problems with bearing life, brake cooling, speedometer or odometer calibration, headlamp aim, bumper height, vehicle ground clearance, and tire or tire chain clearance to the body and chassis. See Changing a Flat Tire on page 5-70 for more information. Putting a used wheel on your vehicle is dangerous. You cannot know how it has been used or how far it has been driven. It could fail suddenly and cause a crash. If you have to replace a wheel, use a new GM original equipment wheel. Tire Chains Notice: Use tire chains only where legal and only when you must. Use only SAE Class U-type chains that are the proper size for your tires. Install them on the rear axle tires and tighten them as tightly as possible with the ends securely fastened. Drive slowly and follow the chain manufacturer’s instructions. If you can hear the chains contacting your vehicle, stop and retighten them. If the contact continues, slow down until it stops. Driving too fast or spinning the wheels with chains on will damage your vehicle. 5-67 Accessory Inﬂator Your vehicle may have an accessory inﬂator system. You can inﬂate things like basketballs and bicycle tires. You can also use it to bring your tire pressure up to the proper pressure. The engine must be running and the gearshift lever must be in PARK (P) for the inﬂator to operate. The accessory inﬂator is located in the rear compartment on the passenger’s side of the vehicle. The accessory inﬂator kit includes a hose and three nozzle adapters. To use the accessory inﬂator, do the following: 1. Attach the appropriate nozzle adapter to the end of the hose. 2. Attach that end of the hose to the object you wish to inﬂate. 3. Remove the dust cover and attach the hose to the outlet. 5-68 If your vehicle is equipped with the air suspension system, load leveling will not function with the inﬂator hose attached to the inﬂator outlet. {CAUTION: Inﬂating something too much can make it explode, and you or others could be injured. Be sure to read the inﬂator instructions, and inﬂate any object only to its recommended pressure. The accessory inﬂator hose also has a built-in air pressure gage. As soon as you start to inﬂate an object it will automatically read the current pressure. 4. Press and release the switch to turn the accessory inﬂator on. The indicator light will remain on while the inﬂator is running. When you are ﬁnished using the inﬂator, press and release the switch to turn it off. Place the inﬂator kit tools and the hose back in the pouch. If a Tire Goes Flat It is unusual for a tire to blowout while you are driving, especially if you maintain your vehicle’s tires properly. If air goes out of a tire, it is much more likely to leak out slowly. But if you should ever have a blowout, here are a few tips about what to expect and what to do: If a front tire fails, the ﬂat tire will create a drag that pulls the vehicle toward that side. Take your foot off the accelerator pedal and grip the steering wheel ﬁrmly. Steer to maintain lane position, and then gently brake to a stop well out of the traffic lane. 5-69 A rear blowout, particularly on a curve, acts much like a skid and may require the same correction you would use in a skid. In any rear blowout remove your foot from the accelerator pedal. Get the vehicle under control by steering the way you want the vehicle to go. It may be very bumpy and noisy, but you can still steer. Gently brake to a stop, well off the road if possible. {CAUTION: Lifting a vehicle and getting under it to do maintenance or repairs is dangerous without the appropriate safety equipment and training. The jack provided with your vehicle is designed only for changing a ﬂat tire. If it is used for anything else, you or others could be badly injured or killed if the vehicle slips off the jack. Use the jack provided with your vehicle only for changing a ﬂat tire. If a tire goes ﬂat, the next part shows how to use the jacking equipment to change a ﬂat tire safely. Changing a Flat Tire If a tire goes ﬂat, avoid further tire and wheel damage by driving slowly to a level place. Turn on your hazard warning ﬂashers. 5-70 {CAUTION: Changing a tire can be dangerous. The vehicle can slip off the jack and roll over or fall on you or other people. You and they could be badly injured or even killed. Find a level place to change your tire. To help prevent the vehicle from moving: 1. Set the parking brake ﬁrmly. 2. Put the shift lever in PARK (P). 3. Be sure the transfer case is in a drive gear—not in NEUTRAL. 4. Turn off the engine and do not restart while the vehicle is raised. 5. Do not allow passengers to remain in the vehicle. To be even more certain the vehicle will not move, you can put blocks at the front and rear of the tire farthest away from the one being changed. That would be the tire on the other side, at the opposite end of the vehicle. When you have a ﬂat tire, use the following example as a guide to assist you in the placement of wheel blocks. Removing Jack A and Tools (SUT) The following steps will tell you next how to use the jack and change a tire. Removing the Spare Tire and Tools (SUT) Your vehicle is equipped with either jack A or jack B and it is stored in the rear cargo compartment on the passenger’s side of the vehicle. The tools for jack A are also stored in the rear cargo compartment. If your vehicle has jack B, the tools are stored under the rear passenger’s seat. To remove the cover, unlock it and then pull the cover off. Remove the tool kit/ﬁrst aid kit to gain access to the tire changing equipment. 5-71 Once it is removed, you will see the following tire changing equipment: To remove the equipment, do the following: 1. Unscrew the wing nut (D) retaining the wheel blocks and remove them. 2. Unscrew the wing nut (C) retaining the jack and remove it. Jack A and Tools A. Tool Bag B. Jack C. Jack Wing Nut D. Wing Nut Retaining Wheel Blocks E. Wheel Blocks 3. Pull the tool bag (A) up and out from the front retention clip. 5-72 4. Open the tool bag. You will ﬁnd the following tools needed to remove the spare tire and change a ﬂat tire: Removing Jack B and Tools (SUT) To remove the cover, unlock it and then pull the cover off. Jack A Tools A. Jack Handle B. Jack Handle Extension (Used for Rear Flats Only) C. Wheel Wrench D. Ratchet Before proceeding, be sure to set the wheel blocks at the appropriate tires as previously shown. Remove the tool kit/ﬁrst aid kit to gain access to the tire changing equipment. 5-73 Once it is removed, you will see the following: Jack B Release the jack by turning the end of the jack handle counterclockwise. To remove the tools, do the following: 1. Pull the bottom of the driver’s side second row seat up to access the tools. See 60/40 Split Bench Seat on page 1-6 for more information. 2. Remove the strap from the seat rail. Then carefully slide the tool bag out from under the seat rail as shown. Take care to not pinch the seat cables or electrical harnesses. 5-74 3. Open the tool bag. You will ﬁnd the following tools needed to remove the spare tire and ﬂat tire: Before proceeding, be sure to set the wheel blocks at the appropriate tires as previously shown. To use a wheel block, lift the wheel block as shown to lock it into place. A. Jack Handle B. Jack Handle Extensions (2) C. Wheel Wrench Jack B Tools D. Wheel Wrench Extension E. Wheel Blocks 5-75 Removing the Spare Tire (SUT) The spare tire is attached to the tire carrier. To remove the spare tire, do the following: 1. Open the tire carrier. See Tailgate/Spare Tire Carrier on page 2-14 for tire carrier operation. 2. Unscrew the wing nut on the back of the tire carrier. 3. Pull off the license plate holder from the spare tire. 4. For jack A, slide the ratchet onto the wheel wrench with the DOWN mark facing you. For jack B, attach the wheel wrench to the wheel wrench extender to remove the wheel nuts. 5-76 Jack A Tools Jack B Tools 5. Turn the ratchet counterclockwise to loosen the wheel nuts. Or, turn the wheel wrench with the wheel wrench extender (jack B) counterclockwise to loosen the wheel nuts. 6. Remove the three wheel nuts holding the spare tire onto the tire carrier. 7. Pull off and gently lower the spare tire to the ground. Set it next to the ﬂat tire. 5-77 Removing the Spare Tire and Tools (SUV) Removing the Jack (SUV) Your vehicle is equipped with either jack A or jack B. The jack (A or B) is stored behind the driver’s side second row seat. 1. Fold the driver’s side second row seat down to access the jack. See 60/40 Split Bench Seat on page 1-6 for more information. For jack B, turn the jack handle end counterclockwise to release it. 2. For jack A, turn the wing nut counterclockwise to release it. Then remove the bracket retaining the jack. Jack B 3. Grasp and lift the jack out of the bracket. Jack A 5-78 Removing the Tools (SUV) The equipment you will need is located under the driver’s side second row seat. To remove the equipment, do the following: 1. Make sure nothing is under the front of the driver’s side second row seat. 2. Locate the tools by lifting the driver’s side second row seat up to expose the ﬂoor. See 60/40 Split Bench Seat on page 1-6 for more information. Jack B Tool Bag For the jack B tool bag, remove the strap from the seat rail. Then carefully slide the tool bag out from under the seat rail as shown. Jack A Tool Bag 3. For the jack A tool bag, carefully slide the tool bag under the seat rail to remove it from the vehicle. 5-79 4. Open the tool bag. You will ﬁnd the following tools needed to remove the spare tire and ﬂat tire: A. Jack Handle B. Jack Handle Extensions (2) C. Wheel Wrench Jack B Tools D. Wheel Wrench Extension E. Wheel Blocks Jack A Tools C. Wheel Wrench D. Ratchet A. Jack Handle B. Jack Handle Extension (2) (Used for Rear Flats Only) 5-80 Before proceeding, be sure to set the wheel blocks at the appropriate tires as previously shown. To use the wheel blocks, do the following: For jack A, locate the wheel blocks which are stored behind the jack on the driver’s side of the vehicle. Removing the Spare Tire (SUV) The spare tire is attached to the tire carrier. To remove the spare tire, do the following: 1. Open the tire carrier. See Tailgate/Spare Tire Carrier on page 2-14 for tire carrier operation. For jack B, remove the wheel blocks from the tool bag. Then, lift the wheel block as shown to lock it into place. Jack B Wheel Blocks 2. Unscrew the wing nut on the back of the tire carrier. 5-81 Jack A Tools 5. Turn the ratchet with the wheel wrench (jack A) counterclockwise to loosen the wheel nuts. 3. Pull off the license plate holder from the spare tire. 4. For jack A, slide the ratchet onto the wheel wrench with the DOWN mark facing you. For jack B, attach the wheel wrench to the wheel wrench extender to remove the wheel nuts. 5-82 Jack B Tools Or, turn the wheel wrench with the wheel wrench extender (jack B) counterclockwise to loosen the wheel nuts. 6. Remove the three wheel nuts holding the spare tire onto the tire carrier. 7. Pull off and gently lower the spare tire to the ground. Set it next to the ﬂat tire. Removing the Flat Tire and Installing the Spare Tire (SUT and SUV) Jack A (SUV and SUT) 1. To remove the center cap, place the ﬂat end of the wheel wrench in the slot on the wheel and carefully pry the center cap out. 5-83 4. Assemble the jack and tools as follows: Front Flat Tire: Attach the jack handle with the hook end connected to the u-hook/clevis on the jack. Slide the ratchet onto the jack handle with the UP mark facing you. Rear Flat Tire: Assemble the jack together with the jack handle and the jack handle extension. Press with the UP mark facing you. The retention clip on the jack handle extension (arrow) so it engages into the jack handle. Slide the ratchet onto the jack handle extension. 5. Turn the ratchet clockwise to raise the jack head to the lifting point. 2. Slide the ratchet onto the wheel wrench with the DOWN mark facing you. 3. Turn the ratchet counterclockwise to loosen the wheel nuts. Do not remove them yet. You will now need to jack the vehicle up using the following instructions. 5-84 6. Front Flat Tire: Position the jack under the vehicle on the frame behind the ﬂat tire where the frame sections overlap. See the following graphic for an approximate measurement of the jack location on the frame. Front Flat Tire – Jack A X = 28.5 inches (72.0 cm) 5-85 {CAUTION:

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2006 Hummer H2 Owners Manual