GM Service Manual Online
For 1990-2009 cars only

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


Object Number: 810945  Size: B2

Slide the temperature lever to the left toward COLD for cooler air. Slide it to the right toward HOT for warmer air.

To change the current mode, press one of the following buttons:

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

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

(Floor): This mode directs most of the air to the floor outlets with some air directed to the outboard outlets for the side windows and some air directed to the windshield.

(Fan): The fan has five speed settings: OFF, 1, 2, 3, and 4. Slide the fan lever to OFF to turn the system off. Outside air will still come out of the floor outlets whenever the vehicle is moving.

(Recirculation): If you press this button, the air inside the cab will be recirculated. If your vehicle has air conditioning, using recirculation will give you maximum cooling. This mode can also be used to keep outside air, odors and dust from entering your vehicle. Recirculation is not available in Defog or Defrost modes.

A/C (Air Conditioning): If your vehicle has this feature, you can use your air conditioner by selecting one of the mode buttons, selecting a fan speed and pressing the A/C button.

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

Using these settings together for long periods of time may cause the air inside of your vehicle to become too dry. To prevent this from happening, after the air in your vehicle has cooled, turn the recirculation mode off. 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 or frost from your windshield. Press the defog button to clear the windows of fog or moisture and warm the passengers. Press the defrost button to remove fog or frost from the windshield more quickly.

(Defog): Press this button to direct the air equally between the windshield and the floor outlets. When you select this mode, the system turns off recirculation and runs the air-conditioning compressor unless the outside temperature is at or below freezing. The recirculation mode cannot be selected while in the defog mode.

(Defrost): Press this button to direct 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 turn off recirculation and run the air-conditioning compressor, unless the outside temperature is at or below freezing. Recirculation cannot be selected while in the defrost mode.