GM Service Manual Online
For 1990-2009 cars only

The heating, cooling, and ventilation for the vehicle can be controlled with this system.

Vehicles Without Air Conditioning


Object Number: 2043599  Size: B1
  1. Fan Control

  2. Temperature Control

  3. Air Delivery Mode Control

(Fan Control): Turn the knob clockwise or counterclockwise to increase or decrease the fan speed.

(Off): Turns the system off.

Temperature Control: Turn the knob clockwise or counterclockwise to increase or decrease the temperature inside the vehicle.

Air Delivery Mode Control: Turn the knob clockwise or counterclockwise to change the current airflow mode.

(Vent): Air is directed to the instrument panel outlets.

(Bi-Level): Air is divided between the instrument panel and floor outlets, with some air directed toward the windshield.

(Floor): Air is directed to the floor outlets with some air directed to the windshield and side windows.

(Defog): This mode clears the windows of fog or moisture. Outside air is directed to the floor and defroster outlets. Adjust the temperature knob for warmer or cooler air. The air conditioning compressor might turn on in this setting to dehumidify the air.

(Defrost): This mode clears the windshield of fog or frost more quickly. Air is directed to the windshield, with some to the floor outlets and front side windows. The air conditioning compressor might turn on in this setting to dehumidify the air. Do not drive the vehicle until all the windows are clear.

Vehicles With Air Conditioning


Object Number: 2043594  Size: B1
  1. Fan Control

  2. Temperature Control

  3. Air Delivery Mode Control

  4. Rear Window Defogger

On hot days, open the windows to let hot inside air escape; then close them. This helps to reduce the time needed for the vehicle to cool down and the system operates more efficiently.

(Air Conditioning): Cools and dehumidifies the air inside of the vehicle.

(Maximum Air Conditioning): Cools the air inside the vehicle faster, by recirculating the inside air.

Rear Window Defogger

For vehicles with a rear window defogger, a warming grid is used to remove fog or frost from the rear window.

It only works when the ignition is in ON/RUN.

(Rear Window Defogger): Press to turn the rear window defogger on or off.

The rear window defogger turns off several minutes after the button is pressed. If turned on again, the defogger will run for several more minutes before turning off. The defogger can also be turned off by turning off the engine.

Do not drive the vehicle until all the windows are clear.

Notice: Do not use a razor blade or sharp object to clear the inside rear window. Do not adhere anything to the defogger grid lines in the rear glass. These actions may damage the rear defogger. Repairs would not be covered by your warranty.