
Air Pressure Gage
If your vehicle has air
brakes, the air pressure
gage is located above the
switchbank in the center
of the instrument panel.
This gage shows the air pressure for both your front
and rear brake systems.
If the needle on the gage indicates that the air pressure
is below 60 to 75 psi (415 to 517 kPa), the low air
warning light will come on. An alarm will also sound if
this happens.
The top pointer shows the pressure available for the
front system, while the bottom pointer shows pressure
for the rear. There should be no more than 4 psi
(28 kPa) difference showing between the systems.
Don’t drive until both pointers are showing at least
120 psi (827 kPa), so you’ll have enough air if you need
to apply your brakes.
Hourmeter Gage
To access the engine hourmeter gage, press the trip
odometer button three times.
The instrument panel cluster displays the accumulated
engine run time hours using the reconfigurable
odometer display. The engine run time hours displays
only when the ignition is in the LOCK or ACCESSORY
position and the trip reset button is pressed for about
four seconds. The value of the accumulated hours does
not change when the battery is disconnected.
The hourmeter resets to 0.0 when 10,000 hours are
accumulated. The instrument panel cluster begins to
reaccumulate the engine run time hours from 0.0 hours.
Audio System(s)
Notice:Before adding any sound equipment to
your vehicle, such as an audio system, CD player,
CB radio, mobile telephone, or two-way radio, make
sure that it can be added by checking with your
dealer. Also, check federal rules covering mobile
radio and telephone units. If sound equipment can
be added, it is very important to do it properly.
Added sound equipment may interfere with
the operation of your vehicle’s engine, radio, or
other systems, and even damage them. Your
vehicle’s systems may interfere with the operation
of sound equipment that has been added.
3-44

Starter Switch Check
{CAUTION:
When you are doing this inspection, the
vehicle could move suddenly. If the vehicle
moves, you or others could be injured.
1. Before you start, be sure you have enough room
around the vehicle.
2. Firmly apply both the parking brake and the
regular brakes.
Do not use the accelerator pedal, and be ready to
turn off the engine immediately if it starts.
3. On automatic transmission vehicles, try to start the
engine in each gear. The starter should work only
in PARK (P), if equipped, or NEUTRAL (N). If
the starter works in any other position, your vehicle
needs service. On manual transmission vehicles,
the starter should work only when the clutch pedal is
all the way down.
Automatic Transmission Shift
Indicator Check
Check that the indicator points to the gear chosen.
Steering Check
Be alert for any changes in steering action, abnormal
front tire wear or steering wheel position. An inspection
or service is needed when the steering wheel is
harder to turn or has too much free play, or if there are
strange sounds when turning or parking.
Brake System Check
Be alert to illumination of the low air warning lamp or for
the tone alarm, or changes in braking action, such as
repeated pulling to one side, unusual sounds when
braking or increased brake pedal travel. Make sure air
brake system reservoirs are drained daily with full
system air pressure, and check system for leaks. Any of
these conditions could indicate the need for brake
system inspection and/or service.
6-29

Climate Control System...................................3-20
Outlet Adjustment........................................3-23
Rear Heating System...................................3-24
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-35
Heater, Engine............................................2-24
Low Warning Light.......................................3-35
Surge Tank Pressure Cap.............................5-38
Cooling System..............................................5-40
Cruise Control................................................3-10
Customer Assistance Information
Customer Assistance for Text
Telephone (TTY) Users............................... 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Reimbursement Program............... 7-5
Reporting Safety Defects to General Motors...... 7-8
Reporting Safety Defects to the
Canadian Government................................ 7-7
Reporting Safety Defects to the
United States Government.......................... 7-7
Roadside Assistance Program......................... 7-5
Service Publications Ordering Information......... 7-8D
Daytime Running Lamps..................................3-15
Daytime Running Lamps Indicator Light.............3-41
Defensive Driving............................................. 4-2
Diesel Engine
Engine Alarm and Automatic Shutdown...........2-18
Exhaust Brake............................................2-25
Exhaust Restrictor.......................................2-21
Fuel............................................................ 5-7
High Idle System.........................................2-19
Starting......................................................2-14
Differential Lock Control, Rear Axle..................... 4-9
Differential Lock Indicator Light.........................3-40
Doing Your Own Service Work........................... 5-4
Dome Lamps.................................................3-16
Door
Locks.......................................................... 2-6
Power Door Locks......................................... 2-7
Driver
Position, Safety Belt.....................................1-14
Driving
At Night.....................................................4-16
City...........................................................4-21
Defensive..................................................... 4-2
4

Driving (cont.)
Drunken....................................................... 4-2
Freeway.....................................................4-22
Hill and Mountain Roads..............................4-24
In Rain and on Wet Roads...........................4-18
Rocking Your Vehicle to Get it Out.................4-30
Tow Hooks.................................................4-31
Winter........................................................4-26
Dual Tire Operation.........................................5-72
E
Electrical System
Add-On Equipment......................................5-88
Fuses and Circuit Breakers...........................5-89
Fusible Links..............................................5-89
Headlamp Wiring.........................................5-88
Instrument Panel Fuse Block.........................5-89
Power Windows and Other Power Options......5-89
Underhood Fuse Block.................................5-92
Windshield Wiper Fuses...............................5-88
Engine
Air Cleaner/Filter.........................................5-33
Alarm and Automatic Shutdown.....................2-18
Battery.......................................................5-55
Change Engine Oil Light...............................3-38
Check and Service Engine Soon Light............3-36Engine (cont.)
Checks Before Operating..............................2-22
Coolant..............................................5-36, 5-38
Coolant Heater............................................2-24
Coolant Temperature Gage...........................3-35
Diesel Engine Exhaust Brake........................2-25
Exhaust.....................................................2-43
Exhaust Restrictor.......................................2-21
Fan Noise..................................................5-45
High Idle System.........................................2-19
Oil .....................................................5-22, 5-26
Oil Life System...........................5-29, 5-31, 5-32
Overheating................................................5-38
Overspeed Warning Light..............................3-39
Reduced Power Light...................................3-41
Shutdown Warning Light...............................3-39
Speed Limiter.............................................3-26
Starter Over-Crank Protection........................2-12
Starting Your Diesel.....................................2-14
Starting Your Gasoline..................................2-12
Entry Lighting.................................................3-17
Event Data Recorders (EDR)............................. 7-6
Exhaust Brake Indicator Light...........................3-40
Exhaust Restrictor...........................................2-21
Extender, Safety Belt.......................................1-26
Exterior Lamps...............................................3-14
5