2015 GMC Savana Owners Manual

professional about sway controls or refer to the trailer manufacturer's recommendations and instructions.

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Weight-Distributing Hitches and Weight Carrying Hitches A weight distributing hitch may be useful with some trailers. Use the following guidelines to determine if a weight distributing hitch should be used.

1. Body to Ground Distance 2. Front of Vehicle When using a weight-distributing hitch, the hitch must be adjusted so the distance (1) remains the same both before and after coupling the trailer to the tow vehicle.

Driving and Operating

9-51

Safety Chains Always attach chains between the vehicle and the trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Always leave just enough slack so the rig can turn. Never allow safety chains to drag on the ground. Trailer Brakes A loaded trailer that weighs more than 680 kg (1,500 lb) needs to have its own brake system that is adequate for the weight of the trailer. Be sure to read and follow the instructions for the trailer brakes so they are installed, adjusted and maintained properly. Trailer Wiring Harness The optional heavy-duty trailer wiring package includes a wiring harness, with a seven-pin connector at the rear of the vehicle and a four-wire harness assembly under the driver side of the instrument

panel. The four-wire harness assembly comes without a connector. If the vehicle does not have a trailer hitch, the seven-wire harness assembly with connector is taped together and located in a frame pocket at the driver side rear left corner of the frame. If the vehicle has a trailer hitch, the seven-wire harness assembly with connector is attached to a bracket on the hitch platform. In both cases, the seven-wire harness has a connector and includes a 30-amp feed wire. The seven-wire harness connector contains the following trailer circuits:

Light Green: Back-up Lamps (10A fuse)**

. White: Ground . Dark Blue: Trailer Brake Signal . Dark Green: Right Rear Stop

and Turn Signal*

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9-52

Driving and Operating

. Red/Black Stripe: Battery Feed

(30A Fuse)

. Brown: Trailer Park Lamp

Supply Voltage (15A fuse)**

. Yellow: Left Rear Stop and Turn

Signal *

The four-wire harness (without connector) contains the following circuits: . Black: Ground . Red/White: Battery Feed . Dark Blue: Trailer Brake Signal

Light Blue: CHMSL/Stoplamp Supply Voltage

* If the vehicle is a cutaway with trailer provisions, a 15 amp fuse will be shared for both left/stop trailer turn and right/stop trailer turn signals. However, the cutaway lighting connector will have a 10 amp fuse for each signal. ** If the vehicle is a cutaway with trailer provisions, a 15 amp fuse will be shared for trailer park lamps and cutaway rear lighting connector park

lamps. Also, a 10 amp fuse will be shared for trailer back-up lamps and cutaway rear lighting connector back-up lamps. Tow/Haul Mode This button is on the instrument panel, to the right of the steering wheel. Pressing this button turns on and off the Tow/Haul Mode.

This indicator light on the instrument cluster comes on when the Tow/ Haul Mode is on. Tow/Haul is a feature that assists when pulling a heavy trailer or a large or heavy load. See Tow/Haul Mode on page 9-27.

Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle Gross Combined Weight Rating (GCWR). See “Weight of the Trailer” in Trailer Towing on page 9-46. Tow/Haul is most useful under the following driving conditions: . When pulling a heavy trailer or a

large or heavy load through rolling terrain.

. When pulling a heavy trailer or a

large or heavy load in stop-and-go traffic.

. When pulling a heavy trailer or a

large or heavy load in busy parking lots where improved low speed control of the vehicle is desired.

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Operating the vehicle in Tow/Haul Mode when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of Tow/Haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/ Haul is recommended only when pulling a heavy trailer or a large or heavy load.

Conversions and Add-Ons

Add-On Electrical Equipment

{ Caution

Some electrical equipment can damage the vehicle or cause components to not work and would not be covered by the warranty. Always check with your dealer before adding electrical equipment.

Driving and Operating

9-53

Add-on equipment can drain the vehicle's 12-volt battery, even if the vehicle is not operating. The vehicle has an airbag system. Before attempting to add anything electrical to the vehicle, see Servicing the Airbag-Equipped Vehicle on page 3-25 and Adding Equipment to the Airbag-Equipped Vehicle on page 3-26.

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9-54

Driving and Operating

2 NOTES

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Vehicle Care

General Information

General Information . . . . . . . . . . 10-2
California Proposition

65 Warning . . . . . . . . . . . . . . . . . 10-2

California Perchlorate

Materials Requirements . . . . 10-2

Accessories and

Modifications . . . . . . . . . . . . . . . 10-2

Vehicle Checks Doing Your Own

Service Work . . . . . . . . . . . . . . . 10-3
Hood . . . . . . . . . . . . . . . . . . . . . . . . 10-4
Engine Compartment

Overview . . . . . . . . . . . . . . . . . . . 10-5
Engine Oil . . . . . . . . . . . . . . . . . . . 10-6
Engine Oil Life System . . . . . . 10-8
Automatic Transmission

Fluid . . . . . . . . . . . . . . . . . . . . . . . 10-9
Engine Air Cleaner/Filter . . . . 10-12
Cooling System . . . . . . . . . . . . 10-13
Engine Coolant . . . . . . . . . . . . . 10-14
Engine Overheating . . . . . . . . 10-18
Engine Fan . . . . . . . . . . . . . . . . . 10-19
Power Steering Fluid . . . . . . . 10-20
Washer Fluid . . . . . . . . . . . . . . . 10-21

Brakes . . . . . . . . . . . . . . . . . . . . . 10-21
Brake Fluid . . . . . . . . . . . . . . . . . 10-22
Battery . . . . . . . . . . . . . . . . . . . . . 10-24
Rear Axle . . . . . . . . . . . . . . . . . . 10-24
Noise Control System . . . . . . 10-25
Starter Switch Check . . . . . . . 10-26
Automatic Transmission Shift

Lock Control Function Check . . . . . . . . . . . . . . . . . . . . . 10-26

Ignition Transmission Lock

Check . . . . . . . . . . . . . . . . . . . . . 10-27

Park Brake and P (Park)

Mechanism Check . . . . . . . . 10-27

Wiper Blade

Replacement . . . . . . . . . . . . . . 10-27

Headlamp Aiming

Headlamp Aiming . . . . . . . . . . 10-28

Bulb Replacement

Bulb Replacement . . . . . . . . . . 10-28
Halogen Bulbs . . . . . . . . . . . . . . 10-28
Headlamps . . . . . . . . . . . . . . . . . 10-29
Front Turn Signal,

Sidemarker, and Parking Lamps . . . . . . . . . . . . . . . . . . . . 10-30
Taillamps . . . . . . . . . . . . . . . . . . . 10-31

Vehicle Care

10-1

Center High-Mounted

Stoplamp (CHMSL) . . . . . . . 10-32
License Plate Lamp . . . . . . . . 10-33
Replacement Bulbs . . . . . . . . . 10-33

Electrical System

Electrical System

Overload . . . . . . . . . . . . . . . . . . 10-34

Fuses and Circuit

Breakers . . . . . . . . . . . . . . . . . . 10-34

Engine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . 10-34

Floor Console Fuse

Block . . . . . . . . . . . . . . . . . . . . . 10-38

Wheels and Tires

Tires . . . . . . . . . . . . . . . . . . . . . . . . 10-40
All-Season Tires . . . . . . . . . . . . 10-41
Winter Tires . . . . . . . . . . . . . . . . 10-42
All-Terrain Tires . . . . . . . . . . . . 10-42
Tire Sidewall Labeling . . . . . . 10-42
Tire Designations . . . . . . . . . . . 10-45
Tire Terminology and

Definitions . . . . . . . . . . . . . . . . 10-46
Tire Pressure . . . . . . . . . . . . . . . 10-49
Tire Pressure Monitor

System . . . . . . . . . . . . . . . . . . . 10-50

Tire Pressure Monitor

Operation . . . . . . . . . . . . . . . . . 10-51

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10-2

Vehicle Care

General Information For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people. Genuine GM parts have one of these marks:

Tire Inspection . . . . . . . . . . . . . . 10-55
Tire Rotation . . . . . . . . . . . . . . . 10-55
Dual Tire Rotation . . . . . . . . . . 10-56
When It Is Time for New

Tires . . . . . . . . . . . . . . . . . . . . . . 10-56
Buying New Tires . . . . . . . . . . . 10-57
Different Size Tires and

Wheels . . . . . . . . . . . . . . . . . . . 10-59

Uniform Tire Quality

Grading . . . . . . . . . . . . . . . . . . . 10-60

Wheel Alignment and Tire

Balance . . . . . . . . . . . . . . . . . . . 10-61
Wheel Replacement . . . . . . . . 10-61
Tire Chains . . . . . . . . . . . . . . . . . 10-62
If a Tire Goes Flat . . . . . . . . . . 10-63
Tire Changing . . . . . . . . . . . . . . 10-65
Full-Size Spare Tire . . . . . . . . 10-73

Jump Starting

Jump Starting . . . . . . . . . . . . . . 10-73

Towing the Vehicle

Towing the Vehicle . . . . . . . . . 10-77
Recreational Vehicle

Towing . . . . . . . . . . . . . . . . . . . . 10-77

Appearance Care

Exterior Care . . . . . . . . . . . . . . . 10-79
Interior Care . . . . . . . . . . . . . . . . 10-84
Floor Mats . . . . . . . . . . . . . . . . . . 10-87

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, many fluids, and some component wear by-products contain and/or emit these chemicals.

California Perchlorate Materials Requirements Certain types of automotive applications, such as airbag initiators, safety belt pretensioners, and lithium batteries contained in Remote Keyless Entry transmitters, may contain perchlorate materials. Special handling may be necessary. For additional information, see www.dtsc.ca.gov/hazardouswaste/ perchlorate.

Accessories and Modifications Adding non‐dealer accessories or making modifications to the vehicle can affect vehicle performance and safety, including such things as airbags, braking, stability, ride and

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Vehicle Care

10-3

This vehicle has an airbag system. Before attempting to do your own service work, see Servicing the Airbag-Equipped Vehicle on page 3-25. Keep a record with all parts receipts and list the mileage and the date of any service work performed. See Maintenance Records on page 11-13.

{ Caution Even small amounts of contamination can cause damage to vehicle systems. Do not allow contaminants to contact the fluids, reservoir caps, or dipsticks.

handling, emissions systems, aerodynamics, durability, and electronic systems like antilock brakes, traction control, and stability control. These accessories or modifications could even cause malfunction or damage not covered by the vehicle warranty. Damage to vehicle components resulting from modifications or the installation or use of non‐GM certified parts, including control module or software modifications, is not covered under the terms of the vehicle warranty and may affect remaining warranty coverage for affected parts. GM Accessories are designed to complement and function with other systems on the vehicle. See your dealer to accessorize the vehicle using genuine GM Accessories installed by a dealer technician. Also, see Adding Equipment to the Airbag-Equipped Vehicle on page 3-26.

Vehicle Checks

Doing Your Own Service Work

{ Warning

It can be dangerous to work on your vehicle if you do not have the proper knowledge, service manual, tools, or parts. Always follow owner manual procedures and consult the service manual for your vehicle before doing any service work.

If doing some of your own service work, use the proper service manual. It tells you much more about how to service the vehicle than this manual can. To order the proper service manual, see Service Publications Ordering Information on page 13-11.

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10-4

Vehicle Care

Hood To open the hood:

2. Go to the front of the vehicle and

lift up the secondary hood release, which is underneath the middle of the hood.

1. Pull the handle with this symbol

on it. It is in front of the driver side door frame near the floor.

If the vehicle has an underhood lamp, it will automatically come on and stay on until the hood is closed. Before closing the hood, be sure all of the filler caps are on properly. Then lift the hood to relieve pressure on the hood prop. Remove the hood prop from the slot in the hood and return the prop to its retainer. Let the hood down and close it firmly.

3. Lift the hood, release the hood prop from its retainer, and put the hood prop into the slot in the hood.

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Engine Compartment Overview

Vehicle Care

10-5

6.0L V8 Engine Shown (4.8L V8 Engine Similar)

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10-6

Vehicle Care

1. Battery on page 10-24. 2. Radiator Pressure Cap. See

Cooling System on page 10-13.

3. Coolant Recovery Tank. See

Cooling System on page 10-13.

4. Automatic Transmission Fluid

Dipstick. See “Checking the Fluid Level” under Automatic Transmission Fluid on page 10-9.

5. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine Oil on page 10-6.

6. Engine Oil Dipstick. See

“Checking Engine Oil” under Engine Oil on page 10-6.

7. Engine Air Cleaner/Filter on

page 10-12.

8. Power Steering Fluid Reservoir.

See Power Steering Fluid on page 10-20.

9. Brake Master Cylinder

Reservoir. See Brake Fluid on page 10-22.

10. Windshield Washer Fluid

Reservoir. See “Adding Washer Fluid” under Washer Fluid on page 10-21.

Engine Oil For diesel engine vehicles, see “Engine Oil” in the Duramax diesel supplement. To ensure proper engine performance and long life, careful attention must be paid to engine oil. Following these simple, but important steps will help protect your investment: . Always use engine oil approved to the proper specification and of the proper viscosity grade. See “Selecting the Right Engine Oil” in this section.

. Check the engine oil level regularly and maintain the proper oil level. See “Checking Engine Oil” and “When to Add Engine Oil” in this section.

. Change the engine oil at the

appropriate time. See Engine Oil Life System on page 10-8.

. Always dispose of engine oil

properly. See “What to Do with Used Oil” in this section.

Checking Engine Oil It is a good idea to check the engine oil level at each fuel fill. In order to get an accurate reading, the vehicle must be on level ground. The engine oil dipstick handle is a loop. See Engine Compartment Overview on page 10-5 for the location of the engine oil dipstick. Obtaining an accurate oil level reading is essential: 1.

If the engine has been running recently, turn off the engine and allow several minutes for the oil to drain back into the oil pan. Checking the oil level too soon after engine shutoff will not provide an accurate oil level reading.

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{ Warning

The engine oil dipstick handle may be hot; it could burn you. Use a towel or glove to touch the dipstick handle.

2. Pull out the dipstick and wipe it

with a clean paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level.

When to Add Engine Oil

If the oil is below the cross-hatched area at the tip of the dipstick, add 1 L (1 qt) of the recommended oil and then recheck the level. See “Selecting the Right Engine Oil” in this section for an explanation of

what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications on page 12-2.

{ Caution

Do not add too much oil. Oil levels above or below the acceptable operating range shown on the dipstick are harmful to the engine. If you find that you have an oil level above the operating range, i.e., the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, the engine could be damaged. You should drain out the excess oil or limit driving of the vehicle and seek a service professional to remove the excess amount of oil.

See Engine Compartment Overview on page 10-5 for the location of the engine oil fill cap.

Vehicle Care

10-7

Add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back in when through. Selecting the Right Engine Oil Selecting the right engine oil depends on both the proper oil specification and viscosity grade. See Recommended Fluids and Lubricants on page 11-10.

Specification Use and ask for licensed engine oils with the dexos1® approved certification mark. Engine oils meeting the requirements for the vehicle should have the dexos1
approved certification mark. This certification mark indicates that the oil has been approved to the dexos1
specification. See www.gmdexos.com.

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10-8

Vehicle Care

{ Caution

Failure to use the recommended engine oil can result in engine damage not covered by the vehicle warranty. Check with your dealer or service provider on whether the oil is approved to the dexos1 specification.

Viscosity Grade Use SAE 5W-30 viscosity grade engine oil. Cold Temperature Operation: In an area of extreme cold, where the temperature falls below −29°C (−20°F), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low

temperatures. When selecting an oil of the appropriate viscosity grade, always select an oil of the correct specification. See “Specification” earlier in this section for more information. Engine Oil Additives/Engine Oil Flushes Do not add anything to the oil. The recommended oils with the dexos specification and displaying the dexos certification mark are all that is needed for good performance and engine protection. Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty. What to Do with Used Oil Used engine oil contains certain elements that can 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 or pouring it on the ground, into sewers, or into streams or bodies of water. Recycle it by taking it to a place that collects used oil.

Engine Oil Life System

When to Change Engine Oil This vehicle has a computer system that indicates when to change the engine oil and filter. This is based on a combination of factors which include engine revolutions, engine temperature, and miles driven. Based on driving conditions, the mileage at which an oil change is indicated can vary considerably. For

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the oil life system to work properly, the system must be reset every time the oil is changed. When the system has calculated that oil life has been diminished, it indicates that an oil change is necessary. A CHANGE ENGINE OIL SOON message comes on. See Engine Oil Messages on page 5-30. Change the oil as soon as possible within the next 1 000 km (600 mi). It is possible that, if driving under the best conditions, the oil life system might indicate that an oil change is not necessary for up to a year. The engine oil and filter must be changed at least once a year and, at this time, the system must be reset. Your dealer has trained service people who will perform this work and reset the system. It is also important to check the oil regularly over the course of an oil drain interval and keep it at the proper level.

If the system is ever reset accidentally, the oil must be changed at 5 000 km (3,000 mi) since the last oil change. Remember to reset the oil life system whenever the oil is changed. How to Reset the Engine Oil Life System Reset the system whenever the engine oil is changed so that the system can calculate the next engine oil change. To reset the system: 1. Turn the ignition key to ON/RUN

with the engine off.

2. Fully press and release the

accelerator pedal slowly three times within five seconds.

3. Turn the key to LOCK/OFF. If the CHANGE ENGINE OIL SOON message comes back on when the vehicle is started, the engine oil life system has not reset. Repeat the procedure.

Vehicle Care

10-9

Automatic Transmission Fluid

When to Check and Change Automatic Transmission Fluid It is usually not necessary to check the transmission fluid level. The only reason for fluid loss is a transmission leak or overheated transmission. If a small leak is suspected, use the following procedures to check the fluid level. However, if there is a large leak, it may be necessary to have the vehicle towed to a dealer and have it repaired before driving the vehicle further. Change the fluid and filter at the intervals listed in Maintenance Schedule on page 11-3, and be sure to use the transmission fluid listed in Recommended Fluids and Lubricants on page 11-10.

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10-10

Vehicle Care

How to Check Automatic Transmission Fluid Because this operation can be difficult, it is recommended to have this check done at your dealer, which can monitor the transmission temperature. The transmission fluid level increases with temperature. To obtain a highly accurate fluid level check, the transmission temperature must be measured. If it is decided to check the fluid level, be sure to follow all the instructions here, or a false reading on the dipstick may occur. { Caution

Too much or too little fluid can damage the transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Too little fluid could cause the

(Continued)

Caution (Continued)

transmission to overheat. Be sure to get an accurate reading if checking the transmission fluid.

Wait at least 30 minutes with the engine off, before checking the transmission fluid level if the vehicle has been driven:

In hot weather, when outside temperatures are above 32°C (90°F). The vehicle is heavily loaded.

. At high speed for quite a while in

hot weather. In heavy traffic and hot weather.

. While pulling a trailer. After driving under these conditions, a hot check can be performed. The fluid should be hot, which is 71°C to 93°C (160°F to 200°F).

A cold fluid level check can be performed 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 the outside temperature is between 15°C to 32°C (60°F to 90°F). Should the fluid level be low during this cold check, the fluid must be checked warm or hot before adding fluid. If the outside temperature is colder than 15°C (60°F) or hotter than 32°C (90°F), a cold check cannot be performed. A warm fluid level check can be performed by driving the vehicle under lightly loaded conditions and outside temperatures between 10°C to 27°C (50°F to 80°F). The vehicle should be driven for at least 24 km (15 mi) before performing a warm check. Checking the fluid warm or hot will give a more accurate reading of the fluid level than a cold check.

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Because the vehicle is equipped with a high-efficiency air-to-oil cooler, the transmission fluid temperature may not reach the required hot fluid level checking temperature under normal lightly loaded driving vehicle conditions.

Checking the Fluid Level Prepare the vehicle: 1. Park the vehicle on a level

place. Keep the engine running. 2. With the parking brake applied, place the shift lever in P (Park). 3. With a foot on the brake pedal,

move the shift lever through each gear range, pausing for about three seconds in each range. When M is reached, move the selector from M1
through M3. Then, position the shift lever in P (Park).

4. Let the engine run at idle for

two minutes or more.

Then, without shutting off the engine, use the steps that follow.

The transmission dipstick is near the center of the engine compartment and will be labeled with the graphic shown. See Engine Compartment Overview on page 10-5 for more information on location.

1. COLD Range 2. WARM Range 3. HOT Range

1. Flip the handle up, pull out the

dipstick, and wipe it with a clean rag or paper towel.

Vehicle Care

10-11

2. Push it back in all the way, wait three seconds, and 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 (1) range for a cold check, transmission temperature 27°C to 32°C (80°F to 90°F); between the COLD (1) and HOT (3) range for a WARM (2) check, 50°C to 60°C (122°F to 140°F); or in the HOT (3) cross-hatched range for a hot check, 71°C to 93°C (160°F to 200°F). Be sure to keep the dipstick pointed down to get an accurate reading. 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.

4.

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10-12

Vehicle Care

How to Add Automatic Transmission Fluid Refer to Recommended Fluids and Lubricants on page 11-10 to determine what kind of transmission fluid to use.

1. WARM Range 2. HOT Range

Using a funnel, add fluid down the transmission dipstick tube only after checking the transmission fluid while it is warm or 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 middle of the WARM (1) or HOT (2) range depending on the ambient temperature and prior driving conditions. Refer to “How to Check Automatic Transmission

Fluid” earlier in this section for instructions on driving to achieve warm or hot transmission fluid. It does not take much fluid, generally less than 0.5 L (1 pt). Do not overfill.

{ Caution

Use of the incorrect automatic transmission fluid may damage the vehicle, and the damage may not be covered by the vehicle warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants on page 11-10.

. After adding fluid, recheck the fluid level as described under “How to Check Automatic Transmission Fluid,” earlier in this section.

. 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 Air Cleaner/Filter

The engine air cleaner/filter is near the center of the engine compartment. See Engine Compartment Overview on page 10-5.

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3. Clean the engine air cleaner/

4.

filter housing. Inspect or replace the engine air cleaner/filter. Make sure that the filter fits properly into the housing.

5. Reinstall the cover and fasten

the retaining clips.

{ Warning

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 flames if the engine backfires. Use caution when working on the engine and do not drive with the air cleaner/filter off.

When to Inspect the Engine Air Cleaner/Filter Inspect or replace the air cleaner/ filter at the scheduled maintenance intervals. See Maintenance Schedule on page 11-3. If driving in dusty/dirty conditions, inspect the filter at each engine oil change. How to Inspect the Engine Air Cleaner/Filter To inspect the air cleaner/filter, remove the filter from the vehicle and lightly shake it to release loose dust and dirt. If the filter remains covered with dirt, a new filter is required. Never use compressed air to clean the filter. To inspect or replace the engine air cleaner/filter: 1. Unhook the retainer clips and

remove the cover.

2. Lift the filter out of the engine air

cleaner/filter housing. Care should be taken to dislodge as little dirt as possible.

Vehicle Care

10-13

{ Caution

If the air cleaner/filter is off, dirt can easily get into the engine, which could damage it. Always have the air cleaner/filter in place when you are driving.

Cooling System The cooling system allows the engine to maintain the correct working temperature.

1. Radiator Pressure Cap

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2. Coolant Recovery Tank 3. Engine Cooling Fan (Out

of View)

{ Warning

An electric engine cooling fan can start even when the engine is not running. To avoid injury, always keep hands, clothing, and tools away from any engine cooling fan.

{ Warning

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.

{ Caution Using coolant other than DEX-COOL® can cause premature engine, heater core, or radiator corrosion. In addition, the engine coolant could require changing sooner. Any repairs would not be covered by the vehicle warranty. Always use DEX-COOL (silicate-free) coolant in the vehicle.

Engine Coolant The cooling system in the vehicle is filled with DEX-COOL® engine coolant. This coolant is designed to remain in the vehicle for 5 years or 240 000 km (150,000 mi), whichever occurs first. The following explains the cooling system and how to check and add coolant when it is low. If there is a problem with engine overheating, see Engine Overheating on page 10-18.

What to Use

{ Warning

Adding only plain water or some other liquid to the cooling system can be dangerous. Plain water and other liquids, can boil before the proper coolant mixture will. The coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, the engine could get too hot but you would not get the overheat warning. The engine could catch fire and you or others could be burned. Use a 50/ 50 mixture of clean, drinkable water and DEX-COOL coolant.

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Use a 50/50 mixture of clean, drinkable water and DEX-COOL coolant. If using this mixture, nothing else needs to be added. This mixture: . Gives freezing protection down

to −37°C (−34°F), outside temperature.

. Gives boiling protection up to

129°C (265°F), engine temperature.

. Protects against rust and

corrosion.

. Will not damage aluminum parts. . Helps keep the proper engine

temperature.

{ Caution

If improper coolant mixture, inhibitors, or additives are used in the vehicle cooling system, the engine could overheat and be damaged. Too much water in the

(Continued)

Caution (Continued)

mixture can freeze and crack engine cooling parts. The repairs would not be covered by the vehicle warranty. Use only the proper mixture of engine coolant for the cooling system. See Recommended Fluids and Lubricants on page 11-10.

Never dispose of engine coolant by putting it in the trash, pouring it on the ground, or into sewers, streams, or bodies of water. Have the coolant changed by an authorized service center, familiar with legal requirements regarding used coolant disposal. This will help protect the environment and your health. Checking Coolant The vehicle must be on a level surface when checking the coolant level.

Vehicle Care

10-15

Check to see if coolant is visible in the coolant recovery tank. If the coolant inside the coolant recovery tank is boiling, do not do anything else until it cools down. If coolant is visible but the coolant level is not at or above the COLD FILL mark, add a 50/50 mixture of clean, drinkable water and DEX-COOL coolant at the coolant recovery tank, but be sure the cooling system is cool before this is done.

The coolant recovery tank cap has this symbol on it. When the engine is cold, the coolant level should be at or above the COLD FILL mark. If it is not, there could be a leak in the cooling system.

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Vehicle Care

If the coolant is low, add the coolant or take the vehicle to a dealer for service. How to Add Coolant to the Recovery Tank for Gasoline Engines

{ Warning

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.

{ Caution

This vehicle has a specific coolant fill procedure. Failure to follow this procedure could cause the engine to overheat and be severely damaged.

If coolant is needed, add the proper DEX-COOL coolant mixture at the coolant recovery tank. How to Add Coolant to the Radiator

{ Warning

Steam and scalding liquids from a hot cooling system can blow out and burn you badly. Never turn the cap when the cooling system, including the surge tank pressure cap, is hot. Wait for the cooling system and surge tank pressure cap to cool.

If coolant is needed, add the proper mixture directly to the radiator, but be sure the cooling system is cool before this is done.

1. Remove the radiator pressure cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise until it first stops. Do not press down while turning the pressure cap. If a hiss is heard, wait for that to stop. A hiss means there is still some pressure left.

2. Keep turning the pressure cap, but now push down as you turn it. Remove the pressure cap.

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3. Fill the radiator with the proper DEX-COOL coolant mixture, up to the base of the filler neck. See Recommended Fluids and Lubricants on page 11-10 for more information about the proper coolant mixture.

4. Fill the coolant recovery tank to

6. Start the engine and let it run

the COLD FILL mark.

5. Reinstall the cap back on the

coolant recovery tank, but leave the radiator pressure cap off.

until the upper radiator hose can be felt getting hot. Watch out for the engine cooling fan.

7. By this time, the coolant level inside the radiator filler neck may be lower. If the level is lower, add more of the proper DEX-COOL coolant mixture through the filler neck until the level reaches the base of the filler neck.

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Vehicle Care

8. Replace the pressure cap. At

any time during this procedure if coolant begins to flow out of the filler neck, reinstall the pressure cap.

{ Caution

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.

Engine Overheating If the vehicle has a diesel engine, see the Duramax diesel supplement. The vehicle has an indicator to warn of engine overheating. There is an engine coolant temperature gauge on the vehicle's instrument cluster. See Engine Coolant Temperature Gauge on page 5-13.

If the decision is made not to lift the hood when this warning appears, but instead get service help right away, see Roadside Assistance Program on page 13-5. If the decision is made to lift the hood, make sure the vehicle is parked on a level surface. Then check to see if the engine cooling fans are running. If the engine is overheating, the fan should be running. If it is not, do not continue to run the engine and have the vehicle serviced. See if the engine cooling fan speed increases when idle speed is doubled by pushing the accelerator pedal down. If it does not, the vehicle needs service. Turn off the engine.

{ Caution

Running the engine without coolant may cause damage or a fire. Vehicle damage would not be covered by the vehicle warranty.

If Steam is Coming from the Engine Compartment { Warning

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.

(Continued)

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Warning (Continued)

If you keep driving when the engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop the engine if it overheats, and get out of the vehicle until the engine is cool.

If No Steam is Coming from the Engine Compartment If an engine overheat warning is displayed but no steam can be seen or heard, the problem may not be too serious. Sometimes the engine can get a little too hot when the vehicle: . Climbs a long hill on a hot day. . Stops after high-speed driving. Idles for long periods in traffic. Tows a trailer. See “Driving on Grades” under Trailer Towing on page 9-46.

If the overheat warning is displayed with no sign of steam: 1. Turn the air off. 2. Turn the heater on to the highest

temperature and to the highest fan speed. Open the windows as necessary.

3. When it is safe to do so, pull off

the road, shift to P (Park) or N (Neutral) and let the engine idle.

If the engine coolant temperature gauge is no longer in the overheat zone or an overheat warning no longer displays, the vehicle can be driven. Continue to drive the vehicle slowly for about 10 minutes. Keep a safe vehicle distance from the vehicle in front. If the warning does not come back on, continue to drive normally and have the cooling system checked for proper fit and function. If the warning continues, pull over, stop, and park the vehicle right away.

Vehicle Care

10-19

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 parked. If the warning is still on, turn off the engine until it cools down. If the decision is made not to lift the hood, get service help right away.

Engine Fan The vehicle has a clutched engine cooling fan. When the clutch is engaged, the fan spins faster to provide more air to cool the engine. In most everyday driving conditions, the fan is spinning slower and the clutch is not fully engaged. This improves fuel economy and reduces fan noise. Under heavy vehicle loading, trailer towing, and/or high outside temperatures, the fan speed increases as the clutch more fully engages, so an increase in fan noise may be heard. This is normal and should not be mistaken as the transmission slipping or making

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Vehicle Care

extra shifts. It is merely the cooling system functioning properly. The fan will slow down when additional cooling is not required and the clutch partially disengages. This fan noise may be heard when starting the engine. It will go away as the fan clutch partially disengages.

Power Steering Fluid

The power steering fluid reservoir is in the engine compartment on the driver side of the vehicle. See Engine Compartment Overview on page 10-5 for reservoir location.

When to Check Power Steering Fluid It is not necessary to regularly check power steering fluid unless there is a leak suspected in the system or an unusual noise is heard. 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: 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 COLD FILL mark. If necessary, add only enough fluid to bring the level up to the mark. To prevent contamination of brake fluid, never check or fill the power steering reservoir with the brake master cylinder cover off. What to Use

{ Caution

Use of the incorrect fluid may damage the vehicle and the damages may not be covered by the vehicle warranty. Always use the correct fluid listed in Recommended Fluids and Lubricants on page 11-10.

To determine what kind of fluid to use, see Recommended Fluids and Lubricants on page 11-10. Always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals.

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Washer Fluid

What to Use When the vehicle needs windshield washer fluid, be sure to read the manufacturer's instructions before use. If operating the vehicle in an area where the temperature may fall below freezing, use a fluid that has sufficient protection against freezing. Adding Washer Fluid

Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overview on page 10-5 for reservoir location.

{ Caution

. Do not use engine coolant

(antifreeze) in the windshield washer. It can damage the windshield washer system and paint.

. Do not mix water with

ready-to-use washer fluid. Water can cause the solution to freeze and damage the washer fluid tank and other parts of the washer system.

. When using concentrated

washer fluid, follow the manufacturer instructions for adding water.

. Fill the washer fluid tank only

three-quarters full when it is very cold. This allows for fluid expansion if freezing occurs, which could damage the tank if it is completely full.

Vehicle Care

10-21

Brakes This vehicle has 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 can come and go or be heard all the time when the vehicle is moving, except when applying the brake pedal firmly.

{ Warning

The brake wear warning sound means that soon the brakes will not work well. That could lead to a crash. When the brake wear warning sound is heard, have the vehicle serviced.

{ Caution

Continuing to drive with worn-out brake pads could result in costly brake repair.

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Vehicle Care

Some driving conditions or climates can cause a brake squeal when the brakes are first applied or lightly applied. This does not mean something is wrong with the 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 torque specifications. See Capacities and Specifications on page 12-2. Brake pads should be replaced as complete 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 that brake service might be required. Brake Adjustment Every time the brakes are applied, with or without the vehicle moving, the brakes adjust for wear.

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. The vehicle was designed and tested with top-quality brake parts. When parts of the braking system are replaced, be sure to get new, approved replacement parts. If this is not done, the brakes might not work properly. For example, installing disc brake pads that are wrong for the vehicle, can change the balance between the front and rear brakes — for the worse. The braking performance expected can change in many other ways if the wrong replacement brake parts are installed.

Brake Fluid

The brake master cylinder reservoir is filled with DOT 3 brake fluid. See Engine Compartment Overview on page 10-5 for the location of the reservoir. There are only two reasons why the brake fluid level in the reservoir might go down:

The brake fluid level goes down because of normal brake lining wear. When new linings are installed, the fluid level goes back up.

. A fluid leak in the brake

hydraulic system can also cause a low fluid level. Have the brake hydraulic system fixed, since a leak means that sooner or later the brakes will not work well.

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Do not top off the brake fluid. Adding fluid does not correct a leak. If fluid is added when the linings are worn, there will be too much fluid when new brake linings are installed. Add or remove brake fluid, as necessary, only when work is done on the brake hydraulic system.

{ Warning

Refer to the Maintenance Schedule to determine when to check the brake fluid. See Maintenance Schedule on page 11-3. Checking Brake Fluid Check brake fluid by looking at the brake fluid reservoir. See Engine Compartment Overview on page 10-5.

If too much brake fluid is added, it can spill on the engine and/or fuel operated heater parts, if equipped. If the vehicle has a diesel engine and a fuel operated heater, see “Fuel Operated Heater (FOH)” in the diesel engine supplement. The fluid will burn if the engine is hot enough. You or others could be burned, and the vehicle could be damaged. Add brake fluid only when work is done on the brake hydraulic system. See “Checking Brake Fluid” in this section.

The fluid level should be above MIN. If it is not, have the brake hydraulic system checked to see if there is a leak.

Vehicle Care

10-23

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 Use only new DOT 3 brake fluid from a sealed container. See Recommended Fluids and Lubricants on page 11-10. Always clean the brake fluid reservoir cap and the area around the cap before removing it. This helps keep dirt from entering the reservoir.

{ Warning

With the wrong kind of fluid in the brake hydraulic system, the brakes might not work well. This could cause a crash. Always use the proper brake fluid.

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Vehicle Care

{ Caution

. Using the wrong fluid can

badly damage brake hydraulic system parts. For example, just a few drops of mineral-based oil, such as engine oil, in the brake hydraulic system can damage brake hydraulic system parts so badly that they will have to be replaced. Do not let someone put in the wrong kind of fluid.

. If brake fluid is spilled on the

vehicle's painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on the vehicle. If you do, wash it off immediately.

Battery Refer to the replacement number shown on the original battery label when a new battery is needed. See Engine Compartment Overview on page 10-5 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

{ Warning

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 (Continued)

Warning (Continued)

page 10-73 for tips on working around a battery without getting hurt.

Infrequent Usage: Remove the black, negative (−) cable from the battery to keep the battery from running down. Extended Storage: Remove the black, negative (−) cable from the battery or use a battery trickle charger.

Rear Axle

When to Check Lubricant Refer to the Maintenance Schedule on page 11-3 to determine how often to check the lubricant.

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How to Check Lubricant

To get an accurate reading, the vehicle should be on a level surface. The proper level for the 2500 and 3500 Series is from 0 to 6 mm (1/4 in) below the bottom of the fill plug hole. Add only enough fluid to reach the proper level.

What to Use Refer to Recommended Fluids and Lubricants on page 11-10 to determine what kind of lubricant to use.

Noise Control System The following information relates to compliance with federal noise emission standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 4 536 kg (10,000 lbs). The Maintenance Schedule provides information on maintaining the noise control system to minimize degradation of the noise emission control system during the life of the vehicle. The noise control system warranty is given in the vehicle warranty booklet. These standards apply only to vehicles sold in the United States.

Vehicle Care

10-25

Federal law prohibits the following acts or the causing thereof: 1. The removal or rendering

inoperative by any person, other than for purposes of maintenance, repair or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control, prior to its sale or delivery to the ultimate purchaser or while it is in use; or 2. The use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. Among those acts presumed to constitute tampering are the acts listed below.

Insulation: . Removal of the noise shields or

any underhood insulation.

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Vehicle Care

Engine: . Removal or rendering engine speed governor, if the vehicle has one, inoperative so as to allow engine speed to exceed manufacturer specifications.

Fan and Drive: . Removal of fan clutch, if the

vehicle has one, or rendering clutch inoperative.

. Removal of the fan shroud, if the

vehicle has one.

Air Intake: . Removal of the air cleaner

silencer.

. Modification of the air cleaner.

Exhaust: . Removal of the muffler and/or

resonator.

. Removal of the exhaust pipes

and exhaust pipe clamps.

Fuel Operated Heater (FOH) — Diesel Engine: . Removal of the muffler.

Starter Switch Check

{ Warning When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured.

1. Before starting this check, be

sure there is enough room around the vehicle.

2. Apply both the parking brake

and the regular brake. Do not use the accelerator pedal, and be ready to turn off the engine immediately if it starts.

3. Try to start the engine in each gear. The vehicle should start only in P (Park) or N (Neutral).

If the vehicle starts in any other position, contact your dealer for service.

Automatic Transmission Shift Lock Control Function Check

{ Warning When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured.

1. Before starting this check, be

sure there is enough room around the vehicle. It should be parked on a level surface.

2. Apply the parking brake. Be

ready to apply the regular brake immediately if the vehicle begins to move.

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3. With the engine off, turn the

ignition on, but do not start the engine. Without applying the regular brake, try to move the shift lever out of P (Park) with normal effort. If the shift lever moves out of P (Park), contact your dealer for service.

Ignition Transmission Lock Check While parked and with the parking brake set, try to turn the ignition to LOCK/OFF in each shift lever position.

The ignition should turn to LOCK/OFF only when the shift lever is in P (Park). The ignition key should come out only in LOCK/OFF.

Contact your dealer if service is required.

Park Brake and P (Park) Mechanism Check { Warning

When you are doing this check, the vehicle could begin to move. You or others could be injured and property could be damaged. Make sure there is room in front of the vehicle in case it begins to roll. Be ready to apply the regular brake at once should the vehicle begin to move.

Park on a fairly steep hill, with the vehicle facing downhill. Keeping