GM Service Manual Online
For 1990-2009 cars only

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

Automatic Operation

Vehicles With Heated and Ventilated Seats Shown, Vehicles Without Similar


Object Number: 2044173  Size: B2
  1. Driver and Passenger Side Power Buttons

  2. Ventilated Seat

  3. AUTO

  4. Recirculation

  5. Air Conditioning

  6. Heated Seat

  7. Fan Control

  8. Defrost

  9. Rear Window Defogger

  10. Air Delivery Mode Control

AUTO (Automatic): The system automatically controls the fan speed, air delivery, air conditioning and recirculation modes in order to heat or cool the vehicle to the desired temperature.

To place the system in automatic mode:

  1. Press the AUTO button.
  2. Adjust the temperature to a comfortable setting, generally, between 70°F (21°C) and 80°F (27°C).
  3. Choosing the coldest or warmest temperature setting will not cause the system to heat or cool any faster. If the system is set at the warmest temperature setting, the system will try to continuously heat the vehicle and will not adjust the system down as the vehicle warms up.

    To avoid blowing cold air in cold weather, the system delays turning on the fan until warm air is available. The system starts out blowing air at the floor, but can automatically change modes as the vehicle warms up to maintain the chosen temperature setting. The length of time needed for warm up depends 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.

The display can be changed from English to metric units through the Driver Information Center (DIC). See DIC Operation and Displays.

Manual Operation

(Driver's Temperature Control): Press to turn the entire climate control system on or off. Turn the knob to increase or decrease the temperature inside the vehicle.

(Passenger's Temperature Control): Press to turn the passenger climate control system on. Turn the knob to increase or decrease the temperature for the front passenger only. The passenger side power button does not turn off the climate control system. The system is set to the same setting as the driver.

(Fan Control): Press to increase or decrease the fan speed. This cancels automatic operation and lets the amount of airflow be adjusted manually. Press AUTO to return to automatic operation. 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): Press to change the direction of the airflow in the vehicle. This cancels automatic operation and lets the air delivery mode be adjusted manually. Press AUTO to return to automatic operation. The outboard air outlets always receive airflow regardless of the mode selected. See Outlet Adjustmentto change this airflow from the outboard outlets.

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. In automatic operation, cooler air is directed to the upper outlets and warmer air to the floor outlets.

(Floor): Air is directed to the floor outlets, with some air directed to the windshield and side windows.

(Defog): This mode clears the windows of fog or moisture. Air is directed to the windshield and floor outlets, with some air directed to the side windows and outboard panel outlets. When this mode is selected, the system turns off recirculation and runs the air-conditioning compressor unless the outside temperature is at or below freezing. If recirculation is selected while in the defog mode, it is cancelled after 10 minutes. If there is fogging on the side windows, remain in defog or defrost mode until they clear.

(Defrost): This mode clears the windshield of fog or frost more quickly. Air is directed to the windshield, with some air directed to the side windows and outboard panel outlets. The air-conditioning compressor runs automatically in this setting, unless the outside temperature is at or below freezing. Recirculation cannot be selected while in the defrost mode. This mode can also cause the fan speed and air temperature to increase.

(Air Conditioning): Press to turn the air conditioning off. Press AUTO to return to automatic operation. To limit fogging on the windshield, the air conditioning compressor cannot be off while in the defrost mode.

(Recirculation): Press once to select recirculation mode or twice to select outside air. If in AUTO mode, press once to select recirculation. 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. Recirculation is not available in the defrost mode and shuts off when defog mode is selected. Both of these features are designed to limit fogging in the vehicle. If recirculation is selected during defog mode, it automatically turns off after 10 minutes. Using the recirculation for long periods of time might cause the air inside the vehicle to become too dry or stuffy. To prevent this from happening, after the air in the vehicle has cooled, press the recirculation button again to select outside air or press the AUTO button.

Rear Window Defogger

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

The defogger only works when the ignition is on or during remote start, if programmed. See "Personal Settings Menu" under Vehicle Personalization for additional information.

(Rear Window Defogger): Press to turn the rear window defogger on or off. The rear window defogger stays on for 10 minutes, before turning off.

If the vehicle's speed is above 30 mph (48 km/h), the rear defogger stays on continuously. If turned on again, the defogger only runs for about five minutes before turning off. The defogger can also be turned off by turning off the engine.

The heated outside rearview mirrors also heat to help clear fog or frost from the surface of the mirror when the rear window defogger is on. See Outside Heated Mirrors.

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.

(Ventilated Seat): If the vehicle has this feature, press to turn the driver or passenger side ventilated seat on. See Heated and Ventilated Seats.

(Heated Seat): If the vehicle has this feature, press to turn the driver or passenger side heated seat and seatback on. See Heated and Ventilated Seats.

Sensors


Object Number: 1455727  Size: B3

The solar sensor located on the instrument panel, near the windshield, monitors the solar heat.

The interior temperature sensor located on the instrument panel to the right of the steering wheel, measures the temperature of the air inside the vehicle.

The climate control system uses the information from these sensors to adjust the temperature, the fan speed and the air delivery, in order to maintain the selected temperature. The system may also supply cooler air to the side of the vehicle facing the sun.

Do not cover the sensors or the automatic climate control system will not work properly.