GM Service Manual Online
For 1990-2009 cars only

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

When the vehicle is first started, the system will recall the last temperature fan and mode settings for that driver.


Object Number: 2056622  Size: B2
  1. Driver and Passenger Power/Temperature Buttons

  2. Heated Seats

  3. Recirculation

  4. Defrost

  5. Rear Window Defogger

  6. Display

  7. AUTO

  8. Fan Control

  9. Air Delivery Mode Control

  10. Air Conditioning Off

Automatic Operation

AUTO (Automatic): When this button is pressed and the temperature is set, the system automatically controls the temperature, air delivery mode, air conditioning compressor and the fan speed. AUTO will appear on the display.

  1. Press the AUTO button.
  2. Adjust the temperature to a comfortable setting between 70°F (21°C) and 80°F (27°C). An initial setting of 73°F (23°C) is suggested.
  3. Choosing the warmest or coldest temperature setting will not cause the system to heat or cool any faster. If the system is set at the warmest or coldest temperature setting, the system remains in manual mode at that temperature and it will not go into automatic mode.

    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 starts 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.

You can switch from English to metric units through the Driver Information Center (DIC). See DIC Operation and Displays for more information.

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.

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

PWR (Power/Temperature): Press the PWR button on the left side of the climate control panel to turn the entire climate control system on or off. Press or to increase or decrease the temperature inside the vehicle. Press the PWR button on the right side of the climate control panel to turn the passenger climate control system on or off. Press or to increase or decrease the temperature for the passenger. If the passenger PWR button is off, the driver temperature switch controls the temperature for the entire vehicle.

(Fan Control): Press to increase or decrease the fan speed. Pressing this switch cancels automatic operation and places the system in manual mode. 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 Control ): Press to change the direction of the airflow inside of the vehicle. Changing the mode cancels automatic operation and places the system in manual mode. Press the AUTO button to return to automatic operation. 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 and 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 window outlets.

(Floor/Defog): This mode clears windows of fog or moisture. Air is directed to the windshield, floor outlets and side windows. In this mode, the system turns off recirculation and runs the air conditioning compressor unless the outside temperature is near or below freezing.

(Defrost): This mode removes fog or frost from the windshield more quickly. Press to direct air to the windshield, with some air directed to the side windows. In this mode, the system automatically turns off the recirculation and runs the air conditioning compressor, unless the outside temperature is near or below freezing. Do not drive the vehicle until all the windows are clear.

A/C OFF (Air Conditioning): Press to turn off the air conditioning compressor. Press AUTO to return to automatic operation. The compressor cannot be turned off in either the defrost or floor/defog mode.

(Recirculation):  Press to turn the recirculation mode on or off. The air conditioning compressor also comes on. This mode recirculates and helps to quickly cool the air inside the vehicle. It can be used to help prevent outside air and odors from entering the vehicle. Recirculation is not available in defrost or floor/defog modes. Using recirculation for long periods of time may cause the air inside the vehicle to become too dry. To prevent this from happening, after the air in the vehicle has cooled, turn the recirculation mode off.

Rear Window Defogger

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

The rear window defogger only works when the engine is running.

(Rear Window Defogger): Press to turn the rear window defogger on or off. Clear as much snow from the rear window as possible.

The rear window defogger will turn off about 10 minutes after the button is pressed when traveling less than 30 mph (48 km/h). 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 will heat to help clear fog or frost from the surface of the mirrors when the rear window defogger is on.

The rear window defogger and heated mirrors are automatically disabled when the retractable hardtop is moving or down.

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.

(Heated/Cooled Seat): Press to turn the feature on. It automatically turns off when the vehicle is turned off. See Heated and Cooled Seats for more information.

Sensors

There are several sensors on the vehicle that measure the temperature and the sun's effect on passenger comfort.

The solar sensor is located on top of the instrument panel near the windshield. It monitors the solar heat then uses the information to maintain the selected temperature when operating in AUTO mode 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 sensor or the system will not work properly.

There is also a sensor located behind the front bumper. This sensor reads the outside air temperature and helps maintain the temperature inside the vehicle. The outside temperature will be displayed in the navigation system only when the engine is running. Any cover on the front of the vehicle could give a false reading of the temperature.

If the outside temperature goes up, the display temperature will not change until:

    • The vehicle's speed is above 15 mph (24 km/h) for five minutes.
    • The vehicle's speed is above 32 mph (51 km/h) for two and one-half minutes.

These delays prevent false readings. If the temperature goes down, the outside temperature will be shown when the vehicle is started. If it has been turned off for less than three hours, the temperature will be recalled from the previous vehicle operation.

There is also an inside temperature sensor located to the left of the ignition button. The automatic climate control system uses this sensor to receive information, so if it is blocked or covered, the system will not function properly.