Engine Coolant Temperature Gage............ 173
Low Coolant Warning Light....................... 173
Wait to Start Indicator............................... 174
Malfunction Indicator Lamp........................ 174
Oil Pressure Gage..................................... 175
Low Oil Level Light................................... 176
Change Engine Oil Light........................... 176
Engine Overspeed Warning Light.............. 177
Engine Shutdown Warning Light................ 177
Transmission Temperature Gage............... 178
Exhaust Brake Indicator Light.................... 178
Differential Lock Indicator Light.................. 178
Reduced Engine Power Light.................... 179
Highbeam On Light................................... 179
Daytime Running Lamps (DRL)
Indicator Light........................................ 179
Low Washer Fluid Warning Light............... 180
Check Gages Warning Light...................... 180
Fuel Gage................................................. 181Water in Fuel Warning Light...................... 182
Air Filter Restriction Indicator..................... 182
Air Pressure Gage..................................... 183
Hourmeter Gage........................................ 183
Audio System(s)......................................... 184
Setting the Time........................................ 185
AM-FM Radio............................................ 186
Radio with Cassette.................................. 189
Radio with CD........................................... 195
Theft-Deterrent Feature
(Non-RDS Radios)................................. 201
Radio Reception........................................ 201
Care of the Cassette Tape Player............. 202
Care of Your CDs..................................... 203
Care of the CD Player.............................. 204
Fixed Mast Antenna.................................. 204
Chime Level Adjustment............................ 204
Section 3 Instrument Panel
138
Service........................................................ 248
California Proposition 65 Warning.............. 248
Doing Your Own Service Work.................. 249
Engine Fan Breakage................................ 250
Fuel............................................................. 251
Gasoline Octane........................................ 251
Gasoline Specifications.............................. 251
Additives................................................... 252
Diesel Engine Fuel.................................... 253
What Fuel to Use...................................... 253
Very Cold Weather Operation.................... 256
Water in Fuel............................................ 256
Running Out of Fuel.................................. 262
Fuel Filter Replacement............................. 263
Fuels in Foreign Countries........................ 264
Filling the Tank......................................... 264
Filling a Portable Fuel Container............... 266Checking Things Under the Hood.............. 266
Hood Latches............................................ 267
Engine Oil (Caterpillar
®Diesel Engine)...... 268
Engine Oil (Gasoline Engine).................... 268
Engine Oil (DURAMAX
®/Isuzu Diesel
Engine).................................................. 272
Engine Oil Life System
(Gasoline Engine).................................. 276
Engine Oil Life System
(DURAMAX
®Diesel)............................... 278
Engine Oil Life System
(Caterpillar
®Diesel Engine).................... 279
Engine Air Cleaner/Filter............................ 280
Automatic Transmission Fluid.................... 282
Manual Transmission Fluid........................ 283
Engine Coolant (Gas and
DURAMAX
®/Isuzu Engines).................... 284
Engine Coolant (Caterpillar®Diesel
Engines)................................................ 287
Coolant Surge Tank Pressure Cap............ 288
Section 5 Service and Appearance Care
245
Engine Overheating................................... 288
Cooling System (Gas and
DURAMAX
®/Isuzu Engines).................... 290
Engine Fan Noise..................................... 294
Power Steering Fluid................................. 295
Windshield Washer Fluid........................... 296
Brakes...................................................... 297
Battery...................................................... 304
Jump Starting............................................ 305
Rear Axle.................................................... 311
Rear Axle Shift Motor................................ 312
Four-Wheel Drive........................................ 312
Front Axle................................................... 313
Noise Control System................................. 314
Tampering with Noise Control System
Prohibited.............................................. 314
Bulb Replacement....................................... 315
Windshield Wiper Blade Replacement....... 316Other Service Items.................................... 317
Fuel Filter.................................................. 317
Primary Fuel Filter and Water Separator...... 317
Secondary Fuel Filter and Water
Separator/Heater (Caterpillar
®Diesel)...... 318
Automatic Ether Injection System
(Caterpillar
®Diesel)................................ 318
Front Wheel Bearings with
Oil-Filled Hubs....................................... 319
Air Conditioning System............................ 320
Tires............................................................ 321
Inflation - Tire Pressure............................. 322
Wheel Loading.......................................... 323
Dual Tire Operation................................... 323
When It Is Time for New Tires.................. 324
Wheel Alignment and Tire Balance............ 324
Tightening the Wheel Nuts........................ 325
Wheel Replacement.................................. 328
If a Tire Goes Flat.................................... 330
Section 5 Service and Appearance Care
246
To reset the Engine Oil Life System, do the
following:
1. Turn the ignition key to RUN with the
engine off.
2. Fully apply and hold the brake pedal while
you fully press and release the accelerator
pedal, pausing slightly at each press and each
release, three times within five seconds.
3. Turn the key to OFF.
If the change engine oil light comes back on when
you start your vehicle, the Engine Oil Life
System has not reset. Repeat the procedure.
Engine Air Cleaner/Filter
The engine air
cleaner/filter is located
in the center of the
engine compartment.
When to Inspect the Engine Air
Cleaner/Filter
If your vehicle has an
air cleaner/filter change
indicator, inspect the
indicator at every
oil change and replace
the filter when the
indicator tells you to.
For vehicles without a change indicator, inspect
the air cleaner/filter at every oil change and
replace the filter at the first oil change after
25,000 miles (40 000 km).
How to Inspect the Engine Air
Cleaner/Filter
Locate the filter change indicator. When the
change indicator turns black or is in the red/orange
change area, replace the filter and reset the
indicator.
280
3. Store the seal in the inlet, located on the
underside of the hood
4. Store the clamp on the coolant surge tank.
Pull the overflow tube out of the white
plastic retainer, slip the clamp over and
reinstall the hose.
The seal will need to be replaced on to the air
cleaner for normal driving, especially in the
warmer months.
Automatic Transmission Fluid
When to Check
A good time to check your automatic transmission
fluid level is when the engine oil is checked.
See your Allison Automatic Transmission
Operator’s Manual to find out when to change
your transmission fluid and filters.
How to Check and What to Use
The Allison Automatic Transmission Operator’s
Manual that came with the vehicle shows how to
check the automatic transmission fluid and
what fluid to use.
Automatic Transmission External Filter
Your automatic transmission filter requires
periodic replacement.
Consult the Allison Automatic Transmission
Operator’s Manual that came with the vehicle for
proper change intervals.
282
Other Service Items
Fuel Filter
Fuel Filter/Pressure Regulator
(Gasoline Engines)
The steel fuel filter/pressure regulator is located
near the engine compartment on the driver’s
side frame rail. If your vehicle has a rear steel fuel
tank, the fuel filter/pressure regulator is located
near the rear fuel tank, on the driver’s side frame
rail. SeeScheduled Maintenance on page 363
for recommended service intervals.
If your vehicle is equipped with the optional Davco
spin-on type filter, it is located on the driver’s
side frame rail.
Fuel Filter (Diesel Engines)
If you have a diesel engine, your fuel filter is
located in the engine compartment on the driver’s
side of the vehicle, or along the driver’s side
frame rail. See “Fuel Filter Replacement” earlier in
this section for further information.
Also seeScheduled Maintenance on page 363for
recommended service intervals.
Primary Fuel Filter and Water
Separator
If you have a diesel
engine, you may have
this spin-on filter. It
is located on the driver’s
side frame rail.
It has a clear plastic drain bowl at the bottom.
Check the drain bowl occasionally for any water or
particles.
To drain the bowl, do the following:
1. Shut off the engine.
2. Partially open the drain valve at the bottom of
the filter.
SeeEngine Oil (Caterpillar
®Diesel Engine) on
page 268orEngine Oil (Gasoline Engine) on
page 268orEngine Oil (DURAMAX
®/Isuzu Diesel
Engine) on page 272for proper disposal
procedures.
317
Secondary Fuel Filter and
Water Separator/Heater
(Caterpillar
®Diesel)
If you have a
Caterpillar®diesel
engine, you may also
have this spin-on
filter and fuel
separator/heater. It will
be mounted in the
engine compartment on
the driver’s side of
the vehicle.
It has a metal drain bowl at the bottom.
Occasionally, check the bowl for any water
or particles.To check or drain the bowl, do the following:
•Shut off the engine.
•Push up on the spring loaded drain valve until
clear fuel is flowing from the valve.
The particles or water will drain out first. See
Engine Oil (Caterpillar
®Diesel Engine) on
page 268orEngine Oil (Gasoline Engine) on
page 268orEngine Oil (DURAMAX
®/Isuzu Diesel
Engine) on page 272for proper disposal
procedures.
Automatic Ether Injection System
(Caterpillar
®Diesel)
If you have a Caterpillar®
diesel engine, you
may have this feature.
The ether cylinder is
located in the engine
compartment on the
driver’s side of the
vehicle.
318
ApplicationCapacities
English Metric
7.2L 250 - 300 hp Engine 32.8 qt 31.0 L
7.2L 250 - 300 hp Engine with A/C and Increased Cooling 33.3 qt 31.5 L
Isuzu 6H 200 - 230 hp Engine 31.6 qt 29.9 L
Isuzu 6H 200 - 230 hp Engine with A/C and Increased
Cooling35.3 qt 33.4 L
Isuzu 6H 250 - 300 hp Engine 34.9 qt 33.0 L
Isuzu 6H 250 - 300 hp Engine with A/C and Increased
Cooling35.4 qt 33.5 L
8.1L 225 - 295 hp Engine 33.3 qt 31.5 L
8.1L with A/C and Increased Cooling 34.9 qt 33.0 L
Engine Oil with Filter
6.6L 14.6 qt 13.8 L
7.2L 30.0 qt 28.4 L
Isuzu 6H
123.8 qt 22.5 L
8.1L 10.0 qt 9.4 L
Check fill level on the oil indicator after initial fill to make sure it is actually full. Oil level may vary depending on
vehicle option content.
1Additional oil is required with auxiliary oil filter systems. Make sure to add enough extra oil to fill the auxiliary oil
filter system. For vehicles equipped with the LUBERFINER 750-C, add 14 quarts (13.25 L).
348