GM Service Manual Online
For 1990-2009 cars only

With this system you can control the heating, cooling, and ventilation for your vehicle.


Object Number: 1250383  Size: B3

Operation

To change the current mode, turn the right control to select one of the following:

(Vent): This mode directs air to the instrument panel outlets.

(Bi-Level): This mode directs the air to the instrument panel outlets and the floor outlets. This position can be used for most winter driving.

(Floor): This mode directs the air to the floor outlets.

The right control can also be used to select defog or defrost modes. Information on defogging and defrosting can be found later in this section.

(Fan): Turn the left control clockwise or counterclockwise to increase or decrease the fan speed. The fan must be on to run the air-conditioning compressor.

(Recirculation): This mode keeps outside air from coming into the vehicle. It can be used to prevent outside air and odors from entering your vehicle or to help heat or cool the air inside your vehicle more quickly. Move the right control to this position to turn recirculation on. Turn the air conditioning on when using recirculation. Recirculation is not recommended for use over long periods of time.

Temperature Control: Turn the center control clockwise or counterclockwise to increase or decrease the temperature inside your vehicle.

A/C (Air Conditioning): Press this button on the left dial to turn the air-conditioning system on or off. When A/C is pressed, an indicator light in the button will come on to let you know that air conditioning is activated.

On hot days, open the windows to let hot inside air escape; then close them. This helps to reduce the time it takes for your vehicle to cool down. It also helps the system to operate more efficiently.

For quick cool down on hot days, do the following:

  1. Select the vent mode.
  2. Select the highest fan speed.
  3. Select A/C.
  4. Select the coolest temperature.

The air-conditioning system removes moisture from the air, so you may sometimes notice a small amount of water dripping underneath your vehicle while idling or after turning off the engine. This is normal.

Defogging and Defrosting

Fog on the inside of windows is a result of high humidity (moisture) condensing on the cool window glass. This can be minimized if the climate control system is used properly. There are two modes to choose from to clear fog or frost from your windshield. Use the defog mode to clear the windows of fog or moisture and warm the passengers. Use the defrost mode to remove fog or frost from the windshield more quickly.

Turn the right control to select the defog or defrost modes.

(Defog): This mode directs the air to the windshield and to the floor outlets. When you select this mode, the system turns off recirculation automatically. The recirculation mode cannot be selected while in the defog mode. Do not drive the vehicle until all the windows are clear.

To help clear the side windows quickly while using air conditioning, do the following:

  1. Select the bi-level mode.
  2. Select the highest fan speed.
  3. Select A/C.
  4. Select the temperature.
(Defrost): This mode directs the air to the windshield. In this mode, the system will automatically force outside air into your vehicle. For best results, turn on the air conditioning. Recirculation cannot be selected while in the defrost mode.

To help clear the windshield quickly, do the following:

  1. Select the defrost mode.
  2. Select A/C.
  3. Select the highest temperature.
  4. Select the highest fan speed.

Rear Window Defogger

The rear window defogger uses a warming grid to remove fog or frost from the rear window.

(Rear Defogger): Press this button on the right dial to turn the rear window defogger on or off. An indicator light in the button will come on to let your know that the rear window defogger is activated. Be sure to clear as much snow from the rear window as possible.

The rear window defogger will turn off about 15 minutes after the button is pressed. The defogger can also be turned off by pressing the button again or by turning off the engine.

Notice: Do not use anything sharp on the inside of the rear window. If you do, you could cut or damage the warming grid, and the repairs would not be covered by the vehicle warranty. Do not attach a temporary vehicle license, tape, a decal or anything similar to the defogger grid.