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Engine Air Cleaner/Filter
SeeEngine Compartment Overviewon page 7!16forthe location of the engine air cleaner/filter.
Inspect the air cleaner/filter every other oil change andreplace it at the first oil change after each 50,000 mile(80 000 km) interval. SeeScheduled Maintenanceonp a g e 8!3for more information. If driving on dusty/dirtyconditions, inspect the filter at each engine oil change.
How to Inspect the Engine Air Cleaner/
Filter
To inspect the air cleaner/filter, remove the engine aircleaner/filter from the vehicle by following Steps 1through 6. When the engine air cleaner/filter isremoved, lightly shake it to release loose dust and dirt.If the engine air cleaner/filter remains caked with dirt, anew filter is required. Never use compressed air toclean the filter.
Replacing the Engine Air Cleaner/Filter
1. Locate the air cleaner/filter assembly . SeeEngine CompartmentOverviewonpage 7!16.
2. Loosen the four screws on the cover of thehousing and lift up the cover.
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Page 476 of 616

What to Use
{WARNING:
Adding only plain water to the cooling system can
be dangerous. Plain water, or some other liquid
such as alcohol, can boil before the proper
coolant mixture will. The vehicle's 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.
Use a 50/50 mixture of clean, drinkable water andDEX-COOL®coolant. If using this mixture, nothingelse needs to be added. This mixture:
.Gives freezing protection down to!34°F (!37°C),outside temperature.
.Gives boiling protection up to 265°F (129°C),engine temperature.
.Protects against rust and corrosion.
.Will not damage aluminum parts.
.Helps keep the proper engine temperature.
Notice:If an improper coolant mixture is used, theengine could overheat and be badly damaged. Therepair cost would not be covered by the vehiclewarranty. Too much water in the mixture can freezeand crack the engine, radiator, heater core, andother parts.
Notice:If extra inhibitors and/or additives are usedin the vehicle's cooling system, the vehicle could bedamaged. Use only the proper mixture of the enginecoolant listed in this manual for the cooling system.SeeRecommended Fluids and Lubricantsonpage 8!10for more information.
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Checking Coolant
The vehicle must be on a level surface when checkingthe coolant level.
Check to see if coolant is visible in the coolant surgetank. If the coolant inside the coolant surge tank isboiling, do not do anything else until it cools down.If coolant is visible but the coolant level is not at orabove the FULL COLD mark, add a 50/50 mixture ofclean, drinkable water and DEX-COOL®coolant at thecoolant surge tank, but be sure the cooling system iscool before this is done.
The coolant surge tank is located in the enginecompartment on the passenger side of the vehicle.SeeEngine Compartment Overviewon page 7!16formore information on location.
The coolant level should be at or above the FULLCOLD mark. If it is not, you may have a leak in thecooling system.
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Page 483 of 616

Overheated Engine Protection
Operating Mode
If an overheated engine condition exists and theENGINE POWER IS REDUCED message is displayed,an overheat protection mode which alternates firinggroups of cylinders helps prevent engine damage. Inthis mode, you will notice a loss in power and engineperformance. This operating mode allows the vehicle tobe driven to a safe place in an emergency. Drivingextended miles (km) and/or towing a trailer in theoverheat protection mode should be avoided.
Notice:After driving in the overheated engineprotection operating mode, to avoid engine damage,allow the engine to cool before attempting anyrepair. The engine oil will be severely degraded.Repair the cause of coolant loss, change the oil andreset the oil life system. SeeEngine Oilonpage 7!17.
Engine Fan Noise
The vehicle has electric cooling fans. You might hearthe fans spinning at low speed during most everydaydriving. The fans can turn off if no cooling is required.Under heavy vehicle loading, trailer towing, and/or highoutside temperatures, or if you are operating the airconditioning system, the fans can change to high speedand you might hear an increase in fan noise. This isnormal and indicates that the cooling system isfunctioning properly. The fans change to low speedwhen additional cooling is no longer required.
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Page 487 of 616

Checking Brake Fluid
Check brake fluid by looking at the brake fluid reservoir.SeeEngine Compartment Overview on page 7!16.
The fluid level should beabove MIN. If it is not,have the brake hydraulicsystem checked to see ifthere is a leak.
After work is done on the brake hydraulic system, makesure the level is above the MIN but not over theMAX mark.
What to Add
Use only new DOT 3 brake fluid from a sealedcontainer. SeeRecommended Fluids and Lubricantsonpage 8!10.
Always clean the brake fluid reservoir cap and the areaaround the cap before removing it. This helps keep dirtfrom 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.
Notice:
.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. SeeWashing Your Vehicleon
page 7!102.
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Page 558 of 616
FusesUsage
1Right Trailer Stop/Turn Lamp
2Electronic Stability SuspensionControl, Automatic Level ControlExhaust
3Left Trailer Stop/Turn Lamp
4Engine Controls
5Engine Control Module, ThrottleControl
6Trailer Brake Controller
7Front Washer
8Oxygen Sensors
9Antilock Brakes System 2
10Trailer Back-up Lamps
11Driver Side Low-Beam Headlamp
12Engine Control Module (Battery)
13Fuel Injectors, Ignition Coils(Right Side)
14Transmission Control Module(Battery)
15Vehicle Back-up Lamps
16Passenger Side Low-Beam Headlamp
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Capacities and Specifications
The following approximate capacities are given in English and metric conversions. SeeRecommended Fluids andLubricantson page 8!10for more information.
ApplicationCapacities
EnglishMetric
Air Conditioning RefrigerantFor the air conditioning system refrigerant chargeamount, see the refrigerant caution label locatedunder the hood. See your dealer for more information.
Cooling System17.6 qt16.7 L
Engine Oil with Filter6.0 qt†5.7 L†
Fuel Tank
Regular26.0 gal98.4 L
Extended31.5 gal119.2 L
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ApplicationCapacities
EnglishMetric
Transmission Fluid (Pan Removal and Replacement)6.0 qt5.7 L
Transfer Case Fluid1.5 qt1.4 L
Wheel Nut Torque140 lb ft190Y
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this manual.Recheck fluid after filling.†Oil filter should be changed at every oil change.
Engine Specifications
EngineVIN CodeTransmissionSpark Plug Gap
6.2L V8FAutomatic0.040 in (1.02 mm)
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