{CAUTION:
Snow can trap exhaust gases under your
vehicle. This can cause deadly CO
(carbon monoxide) gas to get inside. CO
could overcome you and kill you. You
cannot see it or smell it, so you might not
know it is in your vehicle. Clear away
snow from around the base of your
vehicle, especially any that is blocking the
exhaust pipe and/or the fuel operated
heater exhaust system, if equipped. And
check around again from time to time to
be sure snow does not collect there. If
your vehicle has a diesel engine and a
fuel operated heater, see “Fuel Operated
Heater (FOH)” in the diesel engine
supplement.
Open a window just a little on the side of
the vehicle that is away from the wind.
This will help keep CO out.Run your engine only as long as you must. This
saves fuel. When you run the engine, make it go a
little faster than just idle. That is, push the
accelerator slightly. This uses less fuel for the heat
that you get and it keeps the battery (or batteries)
charged. You will need a well-charged battery (or
batteries) to restart the vehicle, and possibly for
signaling later on with your headlamps. Let the
heater run for a while.
Then, shut the engine off and close the window
almost all the way to preserve the heat. Start
the engine again and repeat this only when you
feel really uncomfortable from the cold. But do it as
little as possible. Preserve the fuel as long as
you can. To help keep warm, you can get out of
the vehicle and do some fairly vigorous exercises
every half hour or so until help comes.
259
Service........................................................ 290
Accessories and Modifications................... 290
California Proposition 65 Warning.............. 291
Doing Your Own Service Work.................. 291
Adding Equipment to the Outside of
Your Vehicle.......................................... 292
Fuel............................................................. 292
Gasoline Octane........................................ 293
Gasoline Specifications.............................. 293
California Fuel........................................... 293
Additives................................................... 294
Fuel E85 (85% Ethanol)............................ 295
Fuels in Foreign Countries........................ 296
Filling the Tank......................................... 297
Filling a Portable Fuel Container............... 299
Checking Things Under the Hood.............. 300
Hood Release........................................... 300
Engine Compartment Overview.................. 302
Engine Oil (Gasoline Engine).................... 303
Engine Oil Life System
(Gasoline Engine).................................. 306
Engine Air Cleaner/Filter............................ 308
Automatic Transmission Fluid.................... 309
Engine Coolant.......................................... 312Radiator Pressure Cap.............................. 315
Engine Overheating................................... 315
Cooling System......................................... 317
Engine Fan Noise..................................... 323
Power Steering Fluid................................. 323
Windshield Washer Fluid........................... 324
Brakes...................................................... 325
Battery...................................................... 329
Jump Starting............................................ 330
All-Wheel Drive........................................... 336
Rear Axle.................................................... 337
Front Axle................................................... 338
Noise Control System................................. 338
Tampering with Noise Control System
Prohibited.............................................. 338
Bulb Replacement....................................... 340
Halogen Bulbs........................................... 340
Headlamps................................................ 340
Front Turn Signal, Sidemarker and
Parking Lamps....................................... 342
Center High-Mounted Stoplamp (CHMSL) ... 342
Taillamps................................................... 343
Replacement Bulbs................................... 344
Section 5 Service and Appearance Care
287
Electrical System........................................ 393
Add-On Electrical Equipment..................... 393
Headlamp Wiring....................................... 393
Windshield Wiper Fuses............................ 393Fuses and Circuit Breakers....................... 393
Floor Console Fuse Block......................... 394
Engine Compartment Fuse Block............... 395
Capacities and Speci cations.................... 398
Section 5 Service and Appearance Care
289
Bulb Replacement
For the proper type of replacement bulbs, see
Replacement Bulbs on page 344.
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.
Headlamps
To remove the headlamp assembly from the
vehicle and access the bulbs:
1. Open the hood. SeeHood Release on
page 300for more information.
2. Remove the two bolts from the headlamp
assembly.
3. Remove the two pins on the top of the
headlamp assembly. To remove the pins,
turn the outer pin clockwise and pull it
straight up. To remove the inner pin, turn it
counterclockwise and pull it straight up.
340
4. Lift the inboard side of the headlamp to
release the inboard tab from the radiator
support.
5. Lift the outboard side of the headlamp to
release the outboard tab from the radiator
support.
6. Lower the headlamp to allow the vertical
adjustor to clear the tie bar.
7. Turn the headlamp forward and upward to
remove it from the grille.
8. Turn the bulb connector counterclockwise
and pull it out of the housing.
9. Without removing the headlamp assembly
itself, remove the bulb socket from the back
of the headlamp on the driver’s side.
10. Turn the bulb counterclockwise one quarter
turn to remove it from the socket.
11. On the passenger’s side, turn the bulb
clockwise one turn.12. Install the new bulb into the socket then
reinstall it into the headlamp assembly.
13. Reverse the steps to reinstall the headlamp
assembly.
341
6. Remove the bulb socket by squeezing the
tab on the side of the socket while turning
it counterclockwise.
7. Turn the bulb counterclockwise to remove it.
8. Install a new bulb.
9. Reverse the steps to reinstall the taillamp
assembly.
Replacement Bulbs
Exterior Lamp Bulb Number
Back-up, Rear Parking, Stoplamp,
and Turn Signal Lamp3157
Center High Mounted Stop
Lamp (CHMSL)912
Front Parking and Turn
Signal Lamp3157KX
Front Sidemarker Lamp 194
Headlamps
Composite High-Beam
Headlamp9005
Composite Low-Beam
Headlamp9006GS
Sealed Beam Headlamp H6054
For replacement bulbs not listed here, contact
your dealer/retailer.
Windshield Wiper Blade
Replacement
Windshield wiper blades should be inspected for
wear and cracking. SeeScheduled Maintenance
(Gasoline Engine) on page 405for more
information on wiper blade inspection.
344
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.
{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.Whenever a wheel, wheel bolt or wheel nut is
replaced on a dual wheel setup, check the wheel
nut torque after 100, 1,000 and 6,000 miles
(160, 1 600 and 10 000 km) of driving. For proper
torque, see “Wheel Nut Torque” underCapacities
and Speci cations on page 398.
SeeChanging a Flat Tire on page 366for more
information.Used Replacement Wheels
{CAUTION:
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.
363