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1. Coolant Surge Tank andPressure Cap. SeeEngineCoolant0294.
2.Engine Air Cleaner/Filter0291.
3. Engine Oil Dipstick. SeeEngine Oil0286.
4. Engine Cooling Fan (Out ofView). SeeCoolingSystem0292.
5. Engine Oil Fill Cap. SeeEngine Oil0286.
6.Engine Compartment FuseBlock0310.
7. Brake Fluid Reservoir. SeeBrake Fluid0299.
8. Windshield Washer FluidReservoir. SeeWasherFluid0298.
9.Battery - North America0300.
If the vehicle has a diesel engine,see the Duramax dieselsupplement.
Engine Oil
For diesel engine vehicles, see“Engine Oil”in the Duramax dieselsupplement.
To e n s u r e p r o p e r e n g i n eperformance and long life, carefulattention must be paid to engine oil.Following these simple, butimportant steps will help protectyour investment:
.Use engine oil approved to theproper specification and of theproper viscosity grade. See“Selecting the Right Engine Oil”in this section.
.Check the engine oil levelregularly and maintain theproper oil level. See“CheckingEngine Oil”and“When to AddEngine Oil”in this section.
.Change the engine oil at theappropriate time. SeeEngine OilLife System0288.
.Always dispose of engine oilproperly. See“What to Do withUsed Oil”in this section.
Checking Engine Oil
Check the engine oil level regularly,every 650 km (400 mi), especiallyprior to a long trip. The engine oildipstick handle is a loop. SeeEngine Compartment Overview0283for the location.
{Warning
The engine oil dipstick handle
may be hot; it could burn you.
Use a towel or glove to touch the
dipstick handle.
If a low oil Driver Information Center(DIC) message displays, check theoil level.
Follow these guidelines:
.To g e t a n a c c u r a t e r e a d i n g , p a r kthe vehicle on level ground.Check the engine oil level afterthe engine has been off for atleast two hours. Checking theengine oil level on steep gradesor too soon after engine shutoffcan result in incorrect readings.Accuracy improves when
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Checking Coolant
The vehicle must be on a levelsurface when checking the coolantlevel.
Check to see if coolant is visible inthe coolant surge tank. If the coolantinside the coolant surge tank isboiling, do not do anything else untilit cools down.
If coolant is visible but the coolantlevel is not at or above the markpointed to, add a 50/50 mixture ofclean, drinkable water andDEX-COOL coolant.
Be sure the cooling system is coolbefore this is done.
If no coolant is visible in the coolantsurge tank, add coolant as follows:
How to Add Coolant to the
Coolant Surge Tank
{Warning
Yo u c a n b e b u r n e d i f y o u s p i l l
coolant on hot engine parts.
Coolant contains ethylene glycol
(Continued)
Warning (Continued)
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.
{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.
The coolant surge tank pressurecap can be removed when thecooling system, including the surgetank pressure cap and upperradiator hose, is no longer hot.
1. Turn the pressure cap slowlycounterclockwise. If a hiss isheard, wait for that to stop.Ahissmeansthereisstillsome pressure left.
2. Keep turning the cap andremove it.
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Do not use the acceleratorpedal, and be ready to turn offthe engine immediately if itstarts.
3. For automatic transmissionvehicles, try to start the enginein each gear. The vehicleshould start only in P (Park) orN(Neutral). If the vehicle startsin any other position, contactyour dealer for service.
For manual transmissionvehicles, put the shift lever inNeutral, push the clutch pedaldown halfway, and try to startthe engine. The vehicle shouldstart only when the clutchpedal is pushed down all theway to the floor. If the vehiclestarts when the clutch pedal isnot pushed all the way down,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, besure there is enough roomaround the vehicle. It should beparked on a level surface.
2. Apply the parking brake. Beready to apply the regularbrake immediately if the vehiclebegins to move.
3. With the engine off, turn theignition on, but do not start theengine. Without applying theregular brake, try to move theshift lever out of P (Park) withnormal effort. If the shift levermoves out of P (Park), contactyour dealer for service.
Ignition Transmission
Lock Check
While parked, and with the parkingbrake set, try to turn the ignition toLOCK/OFF in each shift leverposition.
.For automatic transmissionvehicles, the ignition should turnto LOCK/OFF only when theshift lever is in P (Park).
.For manual transmissionvehicles, the ignition should turnto LOCK/OFF only when youpress the key release button.
On all vehicles, the ignition keyshould come out only in LOCK/OFF.
Contact your dealer if service isrequired.
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Headlamps, Front Turn
Signal, Sidemarker, and
Parking Lamps
Driver Side
1. Low-Beam Headlamp
2. High-Beam Headlamp
3. Front Turn Signal/Sidemarker/Parking Lamp
See your dealer for passenger sidereplacement.
Headlamp
1. Open the hood.
2. Remove the headlamp bulbcover by turning itcounterclockwise.
3. Turn the bulb socketcounterclockwise to remove itfrom the headlamp assemblyand pull it straight out.
4. Unplug the electrical connectorfrom the old bulb by releasingthe clip on the bulb socket.
Turn Signal/Sidemarker/
Parking Lamp
1. Open the hood.
2. Turn the bulb socketcounterclockwise to remove itfrom the headlamp assemblyand pull it straight out.
3. Remove the bulb by pulling itstraight out of the bulb socket.
Taillamps, Turn Signal,
Stoplamps, and Back-Up
Lamps
1. Open the tailgate.
2. Remove the two rear lampassembly screws.
3. Pull the rear lamp assemblyoutboard away from the boxside until the retainers release.There will be a noise when theretainers release.
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308 Vehicle Care
4. Pull the rear lamp assemblystraight back to remove it fromthe vehicle.
5. Turn the bulb socketcounterclockwise.
6. Pull the bulb straight out fromthe socket.
7. Replace the bulb, then insertthe bulb socket into the rearlamp assembly and turnclockwise.
9. Verify the retainer ring is in theproper position. If the retainerring is out of position, it will notengage. Reset the retainer bypulling it forward with a tool.
10. Push the rear lamp assemblystraight in until it is seatedagainst the vehicle.
11 . M a k e s u r e t h e r e a r l a m passembly is flush with thebox side.
12. Reinstall the two rear lampassembly screws.
Center High-Mounted
Stoplamp (CHMSL) and
Cargo Lamp
1. Cargo Lamp Bulbs
2. Center High-MountedStoplamp (CHMSL) Bulb
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To r e p l a c e o n e o f t h e s e b u l b s :
1. Remove the two screws and liftoff the lamp assembly.
2. Turn the bulb socketcounterclockwise and pull itstraight out.
3. Pull the bulb straight out fromthe socket.
Replacement Bulbs
Exterior Lamp BulbNumber
Back-up Lamp 921 (W16W)
Back-up Lamp* 1156
Exterior Lamp BulbNumber
Cargo Lamp 921 (W16W)
CenterHigh-MountedStoplamp(CHMSL)
921LL
Front Turn SignalLamp andParking Lamp
7444NA-T
Sidemarker Lamp W5W LL
High-BeamHeadlamp9005 LL
Low-BeamHeadlampH11 LL
Stoplamp/Taillamp/Turn Signal Lamp7443 W21/5W LL-T
Stoplamp/TurnSignal Lamp/Ta i l l a m p *
11 5 7
*ChassisCabModels
For replacement bulbs not listedhere, contact your dealer.
Electrical System
Electrical System
Overload
The vehicle has fuses to protectagainst an electrical systemoverload. Fuses also protect powerdevices in the vehicle.
Replace a bad fuse with a new oneof the identical size and rating.
If there is a problem on the road andafuseneedstobereplaced,thereis a fuse puller in the EngineCompartment Fuse Block. Replacethe fuse as soon as possible withone of the same amperage rating.
Headlamp Wiring
An electrical overload may causethe lamps to go on and off, or insome cases to remain off. Have theheadlamp wiring checked right awayif the lamps go on and off orremain off.
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Windshield Wipers
If the wiper motor overheats due toheavy snow or ice, the windshieldwipers will stop until the motor coolsand will then restart.
Although the circuit is protectedfrom electrical overload, overloaddue to heavy snow or ice maycause wiper linkage damage.Always clear ice and heavy snowfrom the windshield before using thewindshield wipers.
If the overload is caused by anelectrical problem and not snow orice, be sure to get it fixed.
Fuses
The wiring circuits in the vehicle areprotected from short circuits byfuses. This greatly reduces thechance of fires caused by electricalproblems.
Look at the silver-colored bandinside the fuse. If the band is brokenor melted, replace the fuse. Be sureyou replace a bad fuse with a newone of the identical size and rating.
If a fuse goes out, replace the fuseas soon as you can.
Engine Compartment
Fuse Block
If the vehicle has a diesel engine,see the Duramax dieselsupplement.
The engine compartment fuse blockis in the engine compartment, onthe driver side of the vehicle.
Lift the cover to access the fuseblock.
Caution
Spilling liquid on any electrical
component on the vehicle may
damage it. Always keep the
covers on any electrical
component.
Afusepullerisavailableinsidethisfuse block.
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The vehicle may not be equippedwith all of the fuses, relays, andfeatures shown.
Fuses Usage
F1 Traction controlmodule power
F2 Engine controlmodule power
F3 A/C clutch
F4–
F5 Engine controlmodule/Integratedchassis controlmodule/Fuel pumppower module
F6 Wipers
F7 Cargo lamp/Bedlighting (ifequipped)
F8 Fuel injectors-even
F9 Fuel injectors - odd
F10 Engine controlmodule 1
Fuses Usage
F11 Miscellaneous 1/Ignition
F12 Starter
F13 Traction controlmodule
F14–
F15–
F16–
F17 Front axle actuator
F18–
F19 Aeroshutters
F20–
F21 Front blower
F22 Antilock brakesystem valves
F23–
F24 Trailer
F25 Transfer caseelectronic control
F26 Antilock brakesystem pump
Fuses Usage
F27 Trailer brakecontrol module
F28 Rear windowdefogger
F29–
F30 Driver heated seat
F31–
F32 Passengerheated seat
F33 Body controlmodule 3
F34 Fuel system controlmodule
F35 Integrated chassiscontrol module (ifequipped)
F36 Centerhigh-mountedstoplamp
F37 Right high-beamheadlamp
F38 Left high-beamheadlamp