GM Service Manual Online
For 1990-2009 cars only

Object Number: 1511332  Size: B2

This system controls the heating, cooling, and ventilation of the vehicle. In-between modes are available by moving the right control knob between modes with symbols. The in-between mode will be a combination of the two modes that the control is centered between.

Temperature: Turn the left knob on the control panel to adjust the temperature of the air in the vehicle. Turn the knob clockwise or counterclockwise to increase or decrease the temperature.

(Air Conditioning): Press the center of the left knob on the control panel to turn the air conditioning system on or off. An indicator light on the button will be lit when the air conditioning is turned on. This system cools and dehumidifies the air entering the vehicle. The air conditioning will not function if the fan is turned off. If air conditioning is selected with fan off, the indicator light flashes three times and then turns off. A slight change in engine performance may occur when the air conditioning compressor shuts off and turns on again. This is normal. The system is designed to make adjustments to help with fuel economy while still maintaining the selected temperature. The air conditioning system removes moisture from the air, so sometimes there may be a small amount of water dripping underneath the vehicle while idling or after turning off the engine. This is normal.

(Fan): Turn the center knob on the control panel to control the fan speed. Turn the knob clockwise or counterclockwise to increase or decrease the fan speed.

(Off): Turn the center knob to this position to turn the fan off. With the fan off, you may still experience airflow from the system that increases with vehicle speed depending on the mode and temperature settings. Enable recirculation mode to stop this airflow from occurring.

The right knob on the control panel is used to direct the airflow inside the vehicle. Turn the knob to select one of the following modes:

(Recirculation): Press the center of the fan control knob to recirculate air inside the vehicle and prevent outside air from coming in. It can be used to prevent outside odors from entering your vehicle and cool the air inside your vehicle more quickly. Press this button to turn the recirculation mode on or off. An indicator light on the button comes on to let you know the recirculation mode is activated. Recirculation is available in the bi-level, and vent modes. Recirculation is not available while in floor, floor/defog and defrost mode. If recirculation is selected in these modes, the indicator flashes three times indicating it is not available in that mode. When the recirculation mode is turned on, the air conditioning turns on automatically.

(Vent): Turn the right knob on the control panel to this mode to direct air to the instrument panel outlets.

(Bi-Level): Turn the right knob on the control panel to this mode to direct air to the instrument panel outlets, and the remaining air to the floor outlets and the defroster and side window outlets. Cooler air is directed to the upper outlets and warmer air to the floor outlets.

(Floor): Turn the right knob on the control panel to this mode to direct air to the floor outlets, side window outlets, and defroster. Recirculation is not available in this mode.

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 and side windows. Use the 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. For best results, clear all snow and ice from the windshield before defrosting.

(Floor/Defog): Turn the right knob on the control panel to this mode to direct the air to the windshield, the side window outlets, and to the floor outlets. When you select this mode, the system runs the air conditioning system unless the outside temperature is near freezing or below. Recirculation is not available in this mode.

(Defrost): Turn the right knob on the control panel to this mode to direct most of the air to the windshield, and the side window outlets. When you select this mode, the system runs the air conditioning system unless the outside temperature is near or below freezing. Recirculation is not available in this mode.

Do not drive the vehicle until all the windows are clear.

Rear Window Defogger

The rear window defogger uses a warming grid to remove fog or frost from the rear window when the key is in the ignition and turned to ON.

(Rear Defogger): Press the center of the right knob on the control panel to turn the rear window defogger on or off. First press of this button activates the rear window defogger for 15 minutes and each subsequent activation lasts seven and one-half minutes.

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.