GM Service Manual Online
For 1990-2009 cars only

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

For vehicles with the remote start feature and it is activated, the climate control system heats or cools the inside of the vehicle, with the settings used before the vehicle was turned off. The heated seats, if the vehicle has them, and the rear window defogger will be turned on by the climate control system when it is cold outside. The cooled seat setting is not activated during a remote start. Normal operation of the system will return after the key is turned to the ON/RUN position. See Remote Keyless Entry (RKE) System Operation for more information.


Object Number: 2047648  Size: B2
  1. Fan Control

  2. Temperature Control

  3. Air Delivery Mode Control

  4. Recirculation

  5. Air Conditioning

  6. Rear Window Defogger

Operation

(Off): Turns the climate control system off. Outside air still enters the vehicle and is directed to the floor. The airflow direction and temperature can be adjusted.

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

(Fan Control): Turn clockwise or counterclockwise to increase or decrease the fan speed. The fan speed is temporarily reduced between the transition to a new mode. The fan will resume when the new mode is complete. If the airflow seems low when the fan speed is at the highest setting, the passenger compartment air filter may need to be replaced. For more information, see Passenger Compartment Air Filter and Scheduled Maintenance.

Air Delivery Mode Control: Turn clockwise or counterclockwise to change the direction of the airflow in the vehicle. To change the current mode, select one of the following:

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

(Bi-Level): Air is divided between the instrument panel outlets and the floor outlets. Slightly cooler air is directed to the instrument panel outlets and warmer air is directed to the floor outlets.

(Floor): Air is directed to the floor outlets, with some air directed to the windshield and side window outlets. If recirculation is selected while in this mode, it stays on for three minutes to reduce windshield fogging.

(Floor/Defog): This clears the windows of fog or moisture. Air is directed to the windshield and side window outlets and to the floor outlets. The system runs the air conditioning compressor unless the outside temperature is near or below freezing.

(Defrost): This mode clears the windshield of fog or frost more quickly. Air is directed to the windshield and side window outlets. The system runs the air conditioning compressor unless the outside temperature is near or below freezing.

(Air Conditioning): Press to turn the air conditioning system on or off. An indicator light below the button comes on to show that this mode is on. Air conditioning can be selected in any mode as long as the fan knob is not in the off position.

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

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

  1. Select .
  2. Select .
  3. Select .
  4. Select the coolest temperature.
  5. Select the highest fan speed.

The air-conditioning system removes moisture from the air, so a small amount of water might drip under the vehicle while idling or after turning off the engine. This is normal.

(Recirculation): Press to turn the recirculation mode on. An indicator light below the button comes on to show that this mode is on. This mode recirculates and helps to quickly cool the air inside the vehicle. It can be used to prevent outside air and odors from entering the vehicle. This mode cannot be selected while in the defog or defrost modes. If you try to select the recirculation mode, the indicator light flashes three times and turns off. Operation in this mode during periods of high humidity and cool outside temperatures may result in increased window fogging. If window fogging is experienced, select the defrost mode.

Rear Window Defogger

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

(Rear Window Defogger): Press to turn the rear window defogger on or off. An indicator light below the button comes on to show that the rear window defogger is on. Be sure to clear as much snow from the rear window as possible. The rear window defogger only works when the ignition is in ON/RUN. The rear window defogger stays on for about 20 minutes after the button is pressed if traveling at slow speeds. At higher vehicle speeds, the rear defogger may stay on continuously. If turned on again, the defogger only runs for about 10 minutes before turning off. The defogger can be turned off by pressing the button again, by turning the ignition to ACC/ACCESSORY or ON/RUN, or by turning off the engine. If the vehicle has heated outside rearview mirrors, the mirrors heat to help clear fog or frost from the surface of the mirror when the rear window defogger is on. See Outside Heated Mirrors for more information.

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.