GM Service Manual Online
For 1990-2009 cars only

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


Object Number: 1556734  Size: B2

Automatic Operation

AUTO (Automatic): Press the AUTO button for automatic control of the inside temperature, the air delivery mode, and the fan speed. There might be 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 61°F (15°C) and 89°F (32°C).

  1. Adjust the temperature to a comfortable setting.
  2. Press the PASS button or the up or down arrows on the passenger side to turn the passenger temperature set on and off. When turned on, the passenger temperature will be the same as the driver setting. Press the up or down arrow on passenger side to adjust the passenger temperature setting.
  3. When the passenger's temperature set is off, the passenger display will be off and the driver's set temperature will be for the driver and passenger.

    In cold weather, the system will start at reduced fan speeds to avoid blowing cold air into the 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 warm up will depend on the outside temperature and the length of time that has elapsed since the 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.
  5. 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.

  6. Press OFF to turn the climate control system off. Only the rear defog and heated seats will function. Press AUTO or any other button except the heated seats or rear defog to turn the climate control system back on.

This control has four types of operation.

    • Automatic can set/change the temperature only. AUTO and temperature only will appear on the display.
    • Semi-Automatic Fan can set/change the temperature and mode. The fan operates automatically. The temperature and mode will appear on the display.
    • Semi-Automatic Mode can set/change the temperature and fan speed. The mode operates automatically. The fan speed and temperature will appear on the display.
    • Manual can set/change the temperature, mode and fan. The fan speed, temperature, and mode will appear on the display.

If your vehicle has the remote start feature, the climate control system will automatically regulate the inside temperature of your vehicle when the remote start system is activated. Normal operation and the last setting of the climate control system will return after the key is turned on.

Manual Operation

During daylight hours, the instrument panel brightness control might need to be adjusted to the highest setting, in order to see the indicator lights for the various climate control settings.

OFF: Press this button to turn the climate control system off.

(Temperature): Press these buttons to manually adjust the temperature inside the vehicle. Press the up arrow on the driver or passenger side to raise the temperature, and press the down arrow to lower the temperature. The display will show the selected temperature.

(Fan): Press this button to decrease the fan speed. Pressing the arrows cancels the automatic operation and places the system in manual or semi-automatic mode. Press the AUTO button to return to automatic operation. If the airflow seems low when the fan 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 .

(Fan): Press this button to increase the fan speed. Pressing the arrows cancels the automatic operation and places the system in manual or semi-automatic mode. Press the AUTO button to return to automatic operation. If the airflow seems low when the fan 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 .

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

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

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

(Recirculation): Press this button to turn recirculation mode on or off. This mode keeps outside air from coming into the vehicle. It can be used to help reduce the outside air and odors that enter your vehicle or help cool the air inside the vehicle quicker. Recirculation is not available while in the floor, defrost, or floor/defog modes. Using recirculation for long periods of time may cause the air inside your vehicle to become too dry. Recirculation mode has a five minute timer after which the system allows for some fresh outside air into the vehicle to maintain interior air quality.

(Air Conditioning): Press this button to turn the air conditioning compressor on and off. The indicator light on the button will come on when the air conditioning is on. The indicator light will change with each button press even when conditions prevent operation.

(Heated Seats): Press this button to turn the driver or passenger heated seats on and off. See Heated Seats for additional information.

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

(Defrost): Press this button to direct 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 will have no effect other than turning on the indicator light while in defrost mode. Do not drive the vehicle until all windows are clear.

Sensors

The solar sensor on the vehicle monitors the solar heat and the air inside of the vehicle. This information is used 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.

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

The heated outside rearview mirrors, help to clear fog or frost from the surface of the mirror when the rear window defog button is pressed.

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.