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: 854585  Size: B2

Use the mode knob located on the right side of the climate control panel to select the following modes:

MAX (Maximum): This mode recirculates much of the air inside your vehicle and sends it through the instrument panel outlets. The air conditioning compressor will run automatically in this setting unless the temperature is at or below freezing.

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

(Bi-Level): This mode directs half of the air to the instrument panel outlets, and then directs the remaining air to the floor outlets. Some air may be directed toward the windshield. Cooler air is directed to the upper outlets and warmer air to the floor outlets.

(Floor): This mode directs most of the air to the floor outlets with some air directed toward the outboard outlets (for the side windows) and a little air directed to the windshield. The mode knob can also be used to select defog or defrost mode. Information on defogging and defrosting, see "Defogging and Defrosting" later in this section.

(Fan): Turn the knob located on the left of the climate control panel clockwise or counterclockwise to increase or decrease the fan speed.

Driver or Passenger (Temperature Levers): Slide the lever(s) up or down to increase or decrease the temperature.

A/C (Air Conditioning): Press this button to turn the air-conditioning system on or off. When A/C is pressed, an indicator light above the button will come on to let you know that A/C is active. The instrument brightness control may have to be adjusted to the highest setting during the daytime in order to see the indicator light.

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

For quick cool down on hot days:

  1. Select the MAX recirculation mode.
  2. Select A/C.
  3. Select the coolest temperature.
  4. Select the highest fan speed.

Using these settings together 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, change the mode from MAX to another mode such as bi-level.

The air-conditioning system removes moisture from the air, so you may sometimes notice a small amount of water dripping underneath your vehicle while idling or after turning off the engine. This is normal.

Defogging and Defrosting

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

Turn the mode knob to select the defog or defrost mode.

(Floor/Defog): This mode directs the air equally between the windshield and the floor outlets. When you select this mode, the system turns on the air-conditioning compressor unless the outside temperature is at or below freezing.

FRONT (Defrost): Pressing FRONT directs most of the air to the windshield and the side window outlets, with some air directed to the floor outlets. In this mode, the system will automatically run the air-conditioning compressor, unless the outside temperature is at or below freezing.

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 ignition is in RUN.

REAR: Press this button to turn the rear window defogger on or off. When this button is pressed an indicator light above the button will come on to show that the rear window defogger is active. The instrument brightness control may have to be adjusted to the highest setting during the daytime in order to see the indicator light. Be sure to clear as much snow from the rear window as possible.

The rear window defogger will turn off approximately 15 minutes after the button is pressed. If turned on again, the defogger will only run for approximately seven and one-half minutes before turning off. The defogger can also be turned off by pressing the button again or by turning off the engine.

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.