1999 GMC SAFARI heater

2-
2-1
Section 2 Features and Controls
Here you can learn about the many standard and optional features on your vehicle, and information on starting,
shifting and braking. Also explained are the instrument panel and the warning systems that tell you if everything is
working properly
-- and what to do if you have a problem.
2
-2 Keys
2
-4 Front Doors
2
-4 Rear Doors
2
-6 Door Locks
2
-8 Keyless Entry System (Option)
2
-11 Sliding Door
2
-14 Hatch
2
-15 Theft
2
-16 Passlock

2-16 New Vehicle ªBreak-Inº
2
-17 Ignition Positions
2
-18 Starting Your Engine
2
-20 Engine Coolant Heater (If Equipped)
2
-21 Automatic Transmission Operation
2
-24 Parking Brake
2
-25 Shifting Into PARK (P)
2
-28 Shifting Out of PARK (P)
2
-28 Parking Over Things That Burn
2
-29 Engine Exhaust2
-29 Running Your Engine While You're Parked
2
-30 Locking Rear Axle
2
-30 All-Wheel Drive (Option)
2
-31 Windows
2
-33 Horn
2
-33 Tilt Wheel (If Equipped)
2
-33 Turn Signal/Multifunction Lever
2
-39 Exterior Lamps
2
-41 Interior Lamps
2
-42 Mirrors
2
-44 Storage Compartments
2
-52 Ashtrays and Cigarette Lighter
2
-53 Sun Visors
2
-53 Accessory Power Outlets
2
-54 HomeLink
Transmitter (Option)
2
-58 The Instrument Panel - Your
Information System
2
-61 Warning Lights, Gages and Indicators

2-20
Engine Coolant Heater (If Equipped)
In very cold weather, 0
F
(
-18
C) or colder, the
engine coolant heater can
help. You'll get easier
starting and better fuel
economy during engine
warm
-up. Usually, the
coolant heater should be
plugged in a minimum of
four hours prior to starting
your vehicle.
To Use the Engine Coolant Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical cord.
The engine coolant heater cord is located on the
driver's side of the engine compartment, near the
power steering fluid reservoir.
3. Plug it into a normal, grounded 110
-volt AC outlet.
CAUTION:
Plugging the cord into an ungrounded outlet
could cause an electrical shock. Also, the wrong
kind of extension cord could overheat and cause
a fire. You could be seriously injured. Plug the
cord into a properly grounded three
-prong
11 0
-volt AC outlet. If the cord won't reach, use
a heavy
-duty three-prong extension cord rated
for at least 15 amps.
4. Before starting the engine, be sure to unplug
and store the cord as it was before to keep it away
from moving engine parts. If you don't, it could
be damaged.
How long should you keep the coolant heater plugged
in? The answer depends on the outside temperature, the
kind of oil you have, and some other things. Instead of
trying to list everything here, we ask that you contact
your dealer in the area where you'll be parking your
vehicle. The dealer can give you the best advice for
that particular area.

2-59
A. Lamp Switches
B. Instrument Panel Dimmer
C. Multifunction Lever
D. Hazard Lamp Switch
E. Transmission Shift Lever
F. Ignition Switch
G. Rear Defogger (Option)
H. Comfort Controls
I. Rear A/C Control (Option)
J. Rear Heater Control (Option)K. Rear Washer/Wiper (Option)
L. Front Ashtray
M. Accessory Power Outlets
N. Cupholders/Storage Tray
O. Front Storage Compartment
P. Audio System
Q. Cigarette Lighter
R. Hood Release
S. Dome Override Button

2-63
CAUTION:
If the air bag readiness light stays on after you
start your vehicle, it means the air bag system
may not be working properly. The air bags in
your vehicle may not inflate in a crash, or they
could even inflate without a crash. To help avoid
injury to yourself or others, have your vehicle
serviced right away if the air bag readiness light
stays on after you start your vehicle.
The air bag readiness light should flash for a few
seconds when you turn the ignition key to RUN. If the
light doesn't come on then, have it fixed so it will be
ready to warn you if there is a problem.
Charging System Indicator Light
The charging system light
will come on briefly when
you turn the ignition on, but
the engine is not running,
as a check to show you the
light is working.
Then it should go out once the engine is running.
If it stays on, or comes on while you are driving, you
may have a problem with the electrical charging system.
It could indicate that you have a loose accessory drive
belt, or another electrical problem. Have it checked
right away. Driving while this light is on could drain
your battery.
If you must drive a short distance with the light on,
be certain to turn off all your accessories, such as the
radio and heater/air conditioner.

3-3
BI-LEVEL: This setting brings in outside air and
blows it out through the heater floor vents and the
instrument panel vents. If you move the temperature
knob between hot and cold, cooler air will come out of
the upper vents while warmer air comes out of the floor
vent. The air conditioning compressor may operate in
this setting to cool the air.
VENT: The air comes out at the vents on your
instrument panel. The air conditioning compressor will
not run in this position. Adjust the temperature knob for
warmer or cooler air.
HEATER: Most of the air comes out near the
floor. The rest comes out from the defroster vents under
the windshield and at the front side windows.
BLEND: With this setting, the heated outside air
comes out of both the heater vents and defroster vents.
Adjust the temperature knob for warmer or cooler air.
The air conditioning compressor may operate in this
setting to dehumidify the air.
DEFROST: This setting operates the defroster.
Most of the air comes out near the windshield, with
some going to the floor vents and front side windows.
The air conditioning compressor may operate in this
setting to dehumidify the air.
Heating System
If your vehicle does not have air conditioning, your
heater controls will look like this.
Fan Knob
This control has four positions. To increase airflow,
turn the knob toward HI. To decrease airflow, move it
toward LO.
Temperature Knob
This knob is next to the fan knob. It controls the
temperature of the air flowing into your vehicle. Turn
the knob clockwise for warmer air. Turn the knob
counterclockwise for cooler air.

3-4
Function Knob
This knob is next to the temperature knob. The function
knob allows you to choose the direction of air delivery.
OFF: This setting turns the system off.
VENT: The air comes out at the vents on your
instrument panel.
BI-LEVEL: With this setting, the heated outside
air comes out both the instrument panel vents and heater
vents. Adjust the temperature knob for warmer or
cooler air.
HEATER: Most of the air comes out near the
floor. The rest comes out from the defroster vents under
the windshield and at the front side windows.
BLEND: With this setting, the heated outside air
comes out both the heater vents and defroster vents.
Adjust the temperature knob for warmer or cooler air.
DEFROST: This setting operates the defroster.
Most of the air comes out near the windshield, with
some going to the floor vents and front side windows.
Rear Heating System (Option)
You may have the optional rear heater. The three-speed
fan switch is to the right of the radio. Turn the switch
toward HIGH for higher airflow in the rear area. Turn
the switch to the OFF position to turn the system off.

3-5 Rear Air Conditioning System (Option)
You may have rear air conditioning. The rear air
conditioning switch is located to the right of the heater
controls. Turn the switch toward HIGH for higher
airflow in the rear area. Turn the switch to the OFF
position to turn the system off.
Air Conditioning
Before using your vehicle's air conditioning, open the
windows to clear the vehicle of hot air. This reduces the
time it takes for your vehicle to cool down. Then keep
your windows closed for the air conditioner to work at
its best.
You can use MAX A/C with the temperature knob in the
blue area when it's really hot outside and you need to
cool the inside air quickly. MAX A/C lets in only a little
air from the outside.
If you first use MAX A/C, you can then use A/C with
the temperature knob in the blue are as soon as the
vehicle has cooled down, so outside air will be going
through your vehicle.
If your vehicle has rear air conditioning, setting it on
LOW may enhance the front A/C performance by
allowing trapped refrigerant in the rear lines to circulate.
The rear air conditioning system will only send cooled
air if the front system is on. It can still be used to
circulate air, even if the front system is off.
When the air conditioning, DEFROST or BLEND is on,
you may notice a slight increase or decrease in engine
speed, due to compressor operation. This is normal
because the system is designed to cycle the compressor
on and off to keep the desired temperature.

3-6 Heating
On cold days, use HEATER with the temperature knob
in the red area. Outside air will be brought in through
the floor outlets. The heater works best if you keep your
windows closed while using it.
If you use the optional engine coolant heater before
starting your engine, your heating system will produce
warmer air faster to heat the passenger compartment in
cold weather. See ªEngine Coolant Heaterº in the Index.
Defrosting
Use DEFROST to remove fog or ice from the
windshield quickly in extremely cold conditions. The
temperature knob should be in the red area and the fan
control toward high. The air conditioning compressor
may operate in this setting to dehumidify the air.
The BLEND setting is useful for cold weather with a
large number of passengers or very humid conditions to
help keep the windshield clear.
Ventilation System
For mild outside temperatures when little heating or
cooling is needed, use VENT to direct outside air
through your vehicle. Air will flow through the
instrument panel vents.
Your vehicle's flow
-through ventilation system supplies
outside air to the inside of your vehicle when it is
moving. With the side windows closed, air will flow into
the front air inlet grilles at the base of the windshield,
through the vehicle and out the rear air exhaust valve.
Outside air will also enter the vehicle when the heater or
the air conditioning fan is running.