2002 CHEVROLET AVALANCHE compressor

3-3
(Floor): This setting directs most of the
warmed air through the floor outlets and center floor
console outlets (if equipped), as well as some air
through the windshield defroster outlets and side
window defroster outlets. If air from the center floor
console outlets is not desired, turn the vents off at the
console. Recirculation will not be available in this mode.
See ªRecirculationº following for more information.
(Blend): Airflow is delivered through the floor
outlets, center floor console outlets (if equipped), the
windshield defroster outlets and the side window defroster
outlets. The air flow can be divided between floor and
defrost depending upon where the knob is placed between
the settings. The air conditioning compressor may run
to dehumidify the air to prevent window fogging.
Recirculation will not be available in this mode. See
ªRecirculationº following for more information.
(Defrost): This setting directs most of the air
through the windshield defroster outlets with airflow
also delivered from the side window and the floor
outlets. When in defrost mode, the air conditioning
compressor may run to assist in dehumidifying the
air and limit window fogging. Recirculation will not be
available in this mode. See ªRecirculationº following
for more information.
(Outside Air): This setting should be used for
normal system operation and directs the system to use
outside air. This button is located under the fan knob.
Using outside air will limit stale air odors and help to
prevent excessively humid interior air (from wet boots
or clothing or maximum passenger loads) from being
redirected onto windows.
Pressing the outside air button will cancel the
recirculation button.
(Recirculation): This setting limits the amount
of outside air entering the vehicle to a very small
amount. This button is located under the fan knob. This
will be helpful to limit odors entering the vehicle and
will assist in reaching comfort in very high
temperatures. Pressing recirculation will cause the
system to recirculate interior air continuously and may
cause the vehicle windows to fog if the passenger
compartment floor is excessively wet.
Pressing the recirculation button will cancel outside air
operation. To return to normal system operation and to
prevent stale passenger compartment air, be sure to
return to the outside air position.

3-4
Recirculation will not be available in floor, blend, or
defrost modes to help reduce window fogging. If the
recirculation button is pressed in these modes, the
LED indicator for recirculation will flash three times
indicating that forced outside is activated and
recirculation is not available.
If the air conditioning system is activated and system
demand is high in situations such as city traffic, idling,
or very hot weather, the system will automatically
switch from outside air to recirculation. The LED
indicator will not change. After demand on the system is
not so great, the system will return to outside air.
A/C (Air Conditioning): This button is used to
control the air conditioning compressor. Turning the
system on will allow air to be cooled and dehumidified
inside the vehicle.
Air conditioning will be automatically disabled when
the outside air temperature drops below a level at
which air conditioning is effective.
Electronic Climate Control System
(If Equipped)
Fan Knob
(Fan): The knob on the left side of the electronic
climate control panel regulates the fan speed. To manually
increase airflow, move the knob clockwise. To manually
decrease airflow, move it counterclockwise.
OFF: If the knob is in OFF, outside air will still enter
the vehicle, and will be directed based on the position of
the mode knob.

3-6
(Blend): This setting divides airflow equally
between the floor outlet and the windshield defroster
outlets. The air conditioning compressor may run
to dehumidify the air to prevent window fogging.
Recirculation will not be available in this mode. See
ªRecirculationº following for more information.
(Defrost): This setting directs most air through
the windshield defroster outlets and some through the
floor outlets. The air conditioning compressor may
run to dehumidify the air to prevent window fogging.
Recirculation will not be available in this mode. See
ªRecirculationº following for more information.
(Outside Air): Press this button, located under
the fan knob, to use outside air. Using outside air will
limit stale air odors and help to prevent excessively
humid interior air (from wet boots or clothing or
maximum passenger loads) from being redirected
onto windows.
Pressing the outside air button will cancel the
recirculation button.
(Recirculation): Press this button to limit the
amount of outside air entering the vehicle to a very small
amount. This will be helpful to limit odors entering the
vehicle and will assist in reaching comfort in very hot
temperature conditions. Pressing recirculation will cause
the system to recirculate interior air continuously and
may cause the vehicle windows to fog if the passenger
compartment floor is excessively wet.
Pressing the recirculation button will cancel outside air
operation. To return to normal system operation and to
prevent stale passenger compartment air, be sure to
return to the outside air position.
Recirculation will not be available in floor, blend or
defrost modes to help reduce window fogging. If the
recirculation button is pressed in theses modes, the
LED indicator for recirculation will flash three times
indicating that forced outside air is activated and
recirculation is not available.
If the air conditioning system is activated and system
demand is high in situations such as city traffic, idling,
or very hot weather, the system will automatically
switch from outside air to recirculation. The LED
indicator will not change. After demand on the system
is not so great, the system will return back to outside air.

3-7
A/C (Air Conditioning): Press this button to turn
the air conditioning on and off. The system will cool and
dehumidify the air inside the vehicle when the A/C light
is on. When in AUTO, the A/C is automatically engaged
when necessary.
Air conditioning will be automatically disabled when
the outside temperature drops below a level which air
conditioning is ineffective.
Mode Knob
- Automatic Operation
The right knob on the control panel allows you to
choose the direction of air delivery. When the system is
set in AUTO mode, sensors will control the air delivery
mode. Air will come primarily from the floor or
instrument panel outlets, with some air directed to the
windshield to prevent fogging.
When the system is in AUTO mode, the air conditioning
light will turn on, and the recirculation and outside air
lights turn off. With the system in full automatic control
(both the fan and mode knobs in AUTO), you still
have the ability to override any function.However, continually overriding the outside air or the
A/C compressor will limit the ability of the system to
cool the vehicle quickly.
If you push a button for a function which is not
available, the light next to that button will flash
three times to alert you that it's not available.
To find your comfort zone, start with the 74
F (23
C)
setting and allow about 20 minutes for the system to
adjust the temperature if necessary.
With the automatic setting, the air conditioning
compressor automatically cycles when needed to cool
the air. In cold weather, when the system senses the
need for heat, the airflow will be directed out the floor
outlets. As the interior temperature approaches a desired
setting, the fan speed will decrease. To maintain interior
comfort, the airflow will adjust between the instrument
panel air outlets and floor outlets. On bright sunny days
in cool weather, the airflow may come out of the air
conditioning and floor outlets (bi
-level mode) to
maintain comfort and prevent stuffiness.

6-69
Name Usage
STUD #1 Accessory Power/Trailer Wiring
Feed/Load Leveling
ABS Anti
-Lock Brakes
IGN A Ignition Switch
AIR A.I.R. System
RAP #1 Retained Accessory Power,
Power Mirrors, Power Door Locks,
Power Seat(s)
IGN B Ignition Switch
RAP #2 Retained Accessory Power/Rear
Power Windows, Sunroof, Radio
STUD #2 Accessory Power/Trailer Wiring
Brake Feed
TRL R TRN Right Turn Signal Trailer Wiring
TRL L TRN Left Turn Signal Trailer Wiring
IGN 1 Ignition, Fuel Controls
INJ
-B Ignition, Fuel Controls (Relay)
STARTER Starter (Relay)Name Usage
PARK LP Parking Lamps
FRT HVAC Climate Control System
STOP LP Exterior Lamps, Stoplamps
ECM 1 VCM/PCM
CHMSL Center High Mounted Stoplamp
VEH STOP Stoplamps, Cruise Control
TRL B/U Backup Lamps Trailer Wiring
INJ
-A Fuel Controls, Ignition
RR HVAC Not Used
VEH B/U Vehicle Backup Lamps
ENG 1 Engine Controls, Canister Purge,
Fuel System
ETC Electronic Throttle Control
IGN E A/C Compressor Relay, Rear
Window Defogger, Daytime
Running Lamps, A.I.R. System
B/U LP Backup Lamps, Automatic
Transmission Shift Lock
Control System