GM Service Manual Online
For 1990-2009 cars only

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

For vehicles with remote start , the climate control system comes on and uses the prior temperature settings selected before you exited the vehicle.


Object Number: 1557555  Size: B2

Operation

To change the current mode, select one of the following:

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

(Bi-Level): This mode splits the air between the instrument panel outlets and the floor outlets.

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

The right knob can also be used to select defog or defrost mode. Information on defogging and defrosting can be found later in this section.

Recirculation mode is not allowed in this mode.

(Fan): Turn the center knob clockwise or counterclockwise to increase or decrease the fan speed. In any setting other than off, the fan will run continuously with the ignition on. The fan must be turned on to run the air conditioning (AC) compressor.

(Off): To turn the fan off, turn the knob all the way counterclockwise to the off position.

Temperature Control: Turn the left knob clockwise or counterclockwise to increase or decrease the temperature inside your vehicle.

(Recirculation): Press this button to prevent outside air and odors from entering your vehicle or to help heat or cool the air inside your vehicle more quickly. An indicator light above the symbol comes on in this mode. The air conditioning compressor also comes on. This mode is not available for floor, defog and defrost modes. When the recirculation button is pressed, the recirculation indicator light will flash five times and outside air will be delivered. Operation in this mode during periods of high humidity and cool outside temperatures may result in increased window fogging. If window fogging is experienced, select the defrost mode.

(Outside Air): Press this button to allow outside air to circulate through your vehicle. An indicator light above the symbol comes on in this mode.

(Air Conditioning): Press this button to turn the air conditioning system on or off. When this button is pressed, an indicator light below the symbol comes on to show that the air conditioning is activated.

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 .
  2. Select .
  3. Select .
  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 the vehicle to become too dry. To prevent this from happening, after the air in the vehicle has cooled, turn off the recirculation by pressing the outside air button.

The air conditioning system removes moisture from the air, so a small amount of water might drip underneath the vehicle while idling or after turning off the engine. This is normal.

The air conditioning compressor cannot be turned on when the fan is off.

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.

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

(Defog): This mode directs approximately half of the air to the windshield and the side window outlets and half to the floor outlets. When this mode is selected the system runs the air conditioning compressor. To defog the windows faster, turn the temperature control knob clockwise to the warmest setting. Recirculation mode is not available in defog mode.

(Defrost): This mode directs most of the air to the windshield, with some air directed to the side window outlets and the floor outlets. When this mode is selected the system runs the air conditioning compressor. To defrost the windows faster, turn the temperature control knob clockwise to the warmest setting. Recirculation mode is not available in defog mode.

Rear Window Defogger

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

The rear window defogger will only work when the ignition is in ON/RUN.

(Rear): Press the button to turn the rear window defogger on or off. Be sure to clear as much snow from the rear window as possible. An indicator light below the symbol comes on to show that the rear window defogger is activated.

The rear window defogger turns off approximately 15 minutes after the button is pressed. If turned on again, the defogger only runs for approximately seven minutes before turning off. If turned on again, the defogger will only run for approximately seven minutes before turning off.

If the vehicle speed is greater than 50 mph (80 km/h) and the rear defogger is active, it remains on as long as the speed is greater than 50 mph (80 km/h). The defogger can also be turned off by pressing the button again or by turning off the engine.

If your vehicle has the remote start feature, the rear defogger automatically turns on if it is cold outside. When the vehicle transitions out of the remote start mode, the rear defogger turns off. See Remote Keyless Entry (RKE) System Operation

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.