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: 1466141  Size: B2

Automatic Operation

AUTO (Automatic): Turn both the fan and mode knob to AUTO for automatic control of the inside temperature, the air delivery mode and the fan speed. You may notice a delay of two to three minutes before the fan comes on when the automatic operation is used in cold weather. For the automatic system to function, the temperature must be set between 60°F (15°C) and 90°F (32°C).

  1. Adjust the temperature to a comfortable setting.
  2. Press the PASS button to turn the passenger climate control system on and off. When the passenger system is off, the driver's temperature setting is also used for the passenger and the passenger display is off.
  3. In cold weather, the system will start at reduced fan speeds to avoid blowing cold air into your vehicle until warmer air is available. The system will start out blowing air at the floor but may change modes automatically as the vehicle warms up to maintain the chosen temperature setting. The length of time needed for the air to warm up will depend on the outside temperature and the length of time that has elapsed since your vehicle was last driven.

  4. Wait for the system to regulate. This may take from 10 to 30 minutes. Then adjust the temperature, if necessary.

Do not cover the solar sensor located in the center of the instrument panel, near the windshield. For more information on the solar sensor, see "Sensors" later in this section.

Manual Operation

(Temperature): To manually adjust the temperature inside the vehicle, press the up arrow on the temperature control to raise the temperature and press the down arrow to lower the temperature. The display will show your selection. When one temperature is displayed, the driver temperature is set. When both temperatures are displayed, the temperature for both the driver and passenger are set. Pressing PASS will turn the passenger temperature setting on and off. If only the driver temperature is set, the driver temperature is used for the passenger and the passenger display is off.

(Fan): Turn the fan knob clockwise to increase the fan speed and counterclockwise to decrease the fan speed. Turning the fan knob cancels the automatic fan operation and places the system in manual. Turn the knob to AUTO to return to automatic fan operation. 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. See Passenger Compartment Air Filter for additional information.

(Off): Turning the fan knob off will turn the controller completely off. Only the rear window defogger and heated seats will function when the fan knob is off.

Air Flow: This control has several settings to control the direction of airflow.

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

AUTO: This mode is automatically set depending on the temperature in the vehicle and solar sensor information.

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

(Bi-Level): This mode directs airflow to the instrument panel outlets and to the floor outlets. A small amount of air is also directed to the windshield and the side window outlets.

(Floor): This mode directs most of the air to the floor outlets with some air directed to the side window outlets, and a little air directed to the windshield.

(Air Conditioning): Press this button to turn the air conditioning compressor on or off. The indicator light on the button will come on when the air conditioning is on. The indicator light on the air condition button will light every time the vehicle is started. The air conditioner may be turned off by pressing the air conditioner button.

(Recirculation):  Press this button to turn the recirculation mode on or off. This mode keeps outside air from coming in the vehicle. It can be used to prevent outside air and odors from entering your vehicle or to help cool the air inside your vehicle more quickly. Recirculation is not available in defrost or floor/defog mode. Pressing the recirculation button will turn on the indicator light. Using recirculation for long periods of time may cause the air inside your vehicle to become too dry. To prevent this from happening, after the air in your vehicle has cooled, turn the recirculation mode off.

(Heated Seats): Press this button to turn the heated seats on and off. The button on the left controls the driver's seat and the button on the right controls the passenger's seat. See Heated Seats for additional information.

Sensors

The solar sensor on your vehicle monitors the solar radiation and the air inside of your vehicle, then uses the information to maintain the selected temperature by initiating needed adjustments to the temperature, the fan speed and the air delivery system. The system may also supply cooler air to the side of the vehicle facing the sun. The recirculation mode will also be activated, as necessary. Do not cover the solar sensor located in the center of the instrument panel, near the windshield, or the system will not work properly.

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 floor/defog mode to clear the windows of fog or moisture and warm the passengers. Use defrost to remove fog or frost from the windshield more quickly.

(Floor/Defog): This mode directs the air between the windshield, floor outlets and side windows. When you select this mode, the system turns off recirculation and runs the air-conditioning compressor unless the outside temperature is near or below freezing. Pressing the recirculation button, while in this mode, will have no effect other than turning on the indicator light.

(Defrost): This mode directs most of the air to the windshield, with some air directed to the side windows. In this mode, the system will automatically turn off the recirculation and run the air conditioning compressor, unless the outside temperature is near or below freezing. Pressing the recirculation button, while in this mode, will have no affect other than turning on the indicator light.

Rear Window Defogger

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

The rear window defogger will only work when the engine is running.

(Rear Window Defogger): Press this button to turn the rear window defogger on and off. Be sure to clear as much snow from the rear window as possible.

The rear window defogger will turn off approximately 20 minutes after the button is pressed. If turned on again, the defogger will only run for approximately 20 minutes before turning off. The defogger can also be turned off by pressing the button again or by turning off the engine.

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

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.