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: 929277  Size: B2

Operation

(Fan):  Move the lever away from OFF to turn the system on. Slide the top right lever to the left or right to increase or decrease the fan speed.

If the airflow seems low when the fan is at the highest setting, the passenger compartment air filter, if equipped, may need to be replaced. For more information, see Passenger Compartment Air Filter and Short Trip/City Scheduled Maintenance .

Slide the top left lever to the left or right to direct the airflow inside of your vehicle.

To change the current mode, select one of the following:

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

(Bi-Level): This mode directs most of the air to the instrument panel outlets, and then directs the remaining air to the floor outlets.

(Floor): This mode directs half of the air to the floor outlets with some air directed to the outboard outlets (for the side windows) and some air directed to the windshield.

This lever can also be used to select defog or defrost mode. Information on defogging and defrosting can be found later in this section.

(Outside Air): Slide the lower right lever to the right for outside air. With the lever in this position, outside air will circulate throughout your vehicle.

(Recirculation): Slide the lower right lever to the left for recirculated air. With the lever in this position outside air and odors can be prevented from entering your vehicle and also helps heat or cool the air inside your vehicle more quickly.

If the lever is in the middle of the two positions, you will have both outside and recirculated air inside your vehicle.

If you are in city traffic, your vehicle is stopped and idling or the weather is hot, the system may be switched from the outside air mode to the recirculation mode. To help prevent the air inside of your vehicle from becoming too stale, be sure to return to outside air periodically.

Temperature Control: Slide the lever located on the lower left side to change the temperature. Move it to the right for warmer air and to the left for cooler air. Without air conditioning, the air temperature cannot be less than the outside air temperature.

Air Conditioning (A/C): Press the air conditioning (A/C) button 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 the 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:

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

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 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.

(Defog): This mode directs the air between the windshield, side windows, instrument panel outlets and the floor outlets. The air-conditioning compressor will run automatically in this setting without pressing A/C, unless the outside temperature is at or below freezing.

(Defrost): This mode directs the air to the windshield and the side windows. The air-conditioning compressor will run automatically in this setting without pressing A/C, unless the outside temperature is at or below freezing. Do not drive the vehicle until all the windows are clear.

Rear Window Defogger

If your vehicle has this feature, the rear window defogger uses a warming grid to clear fog from the rear window.


Object Number: 809962  Size: A2

The button is located on the center of the instrument panel, near the vehicle's comfort controls.

The rear window defogger will only work when the ignition is in ON.

(Rear Defogger): Press the defogger button 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 automatically 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 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.