The heating, cooling, and ventilation for the vehicle can be controlled with this system. To avoid window fogging on rainy and humid days at temperatures above freezing, run the air conditioning. Also, it is best to avoid the use of recirculation mode except when maximum air conditioning performance is needed for a short amount of time to avoid exterior odors and fogging.

Dual Climate Control System

Dual Climate Control System for Vehicles with Rear Climate Control

Automatic Operation

AUTO (Automatic Fan): When this position is selected on the fan control, the system adjusts the fan speed. If the OnStar® system is activated when this position is selected, the climate control fan speed will lower.

AUTO (Automatic Mode): 

1. Turn the fan control to the AUTO position.
2. Turn the mode control to the AUTO position.
3. Adjust the temperature to a comfortable setting between 68°F (21°C) and 78°F (26°C).

Choosing the coldest or warmest temperature setting will not cause the system to heat or cool any faster. In cold weather, the system will start at reduced fan speeds to avoid blowing cold air into the 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 to warm the interior depends on the outside temperature and temperature of the vehicle.

4. Wait 20 to 30 minutes for the system to stabilize in order for the system to regulate automatically. Then adjust the temperature as necessary to find your comfort setting.

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.

After the vehicle is started, the display will show the interior temperature settings and the outside temperature.

If the AUTO position is selected on the fan or mode control, the system automatically controls the air conditioning compressor. The A/C compressor will run automatically even at cool outside temperatures in order to dehumidify the air. The A/C indicator light is lit when the system is operating automatically, even at near freezing outside temperatures. Press the A/C button on the fan control to turn off the A/C. For improved window clearing performance in defog or defrost modes, the A/C compressor runs automatically.

(AUTO RECIRCULATION): If the AUTO position is selected on either the fan or mode control, the system automatically controls the air inlet to supply fresh outside air or recirculate the interior air to cool the car faster. The indicator light on the recirculation button will light whenever the system switches to recirculation. You may force outside air by pressing the recirculation button when the light is lit. For vehicles without rear climate controls, press the outside air button to force outside air. The next time AUTO fan or mode is selected, the air inlet will reset back to AUTO operation.

Manual Operation

(Fan): Turn the left control knob clockwise or counterclockwise to adjust the fan speed. Turning this control completely counterclockwise will turn on the automatic fan operation. Turning this control to the "O" position will turn the climate control system off. If the airflow seems low when the fan speed is at the highest setting, the passenger compartment air filter may need to be replaced. See Passenger Compartment Air Filter .

(Off): Turn the left control knob to this position to turn the entire climate control system off. Outside air still enters the vehicle and is directed to the floor. The airflow direction and temperature can be adjusted, as indicated below. If the temperature is adjusted while the system is off, the display will light to show the current settings.

Mode Control: Turn the right knob clockwise or counterclockwise to change the current airflow mode.

AUTO: Turn the control to this position to turn on the automatic delivery mode operation.

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

(Bi-Level): Turn the control to this mode to direct approximately half of the air to the instrument panel outlets and most of the remaining air to the floor outlets. In automatic operation, cooler air is directed to the upper outlets and warmer air to the floor outlets.

(Floor): Turn the control to this mode to direct most of the air to the floor outlets with some air directed to the side window outlets and the windshield. If recirculation is selected, it only stays on for three minutes to reduce windshield fogging. The mode control can also be used to select the floor/defog mode. In this mode, the system automatically uses outside air. Information on defogging and defrosting can be found later in this section.

(Outside Air): Press this button to allow outside air to come into the vehicle. Press this button to turn the outside air mode on or off. When the button is pressed, the indicator light comes on. Pressing the recirculation button will cancel this mode.

(Recirculation): Press this button to recirculate cabin air through the vehicle. An indicator light below the button comes on to show that this mode is activated. This mode can be used to prevent outside air and odors from entering the vehicle or to help cool the air inside the vehicle more quickly. This mode cannot be selected while in the defog or defrost modes. If you try to select the recirculation mode, the indicator light flashes three times and turns off. 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.

(Driver's Temperature Controls) : Press these buttons next to the fan control to manually increase or decrease the temperature inside the vehicle.

(Passenger's Temperature Controls): Press these buttons next to the mode control to manually increase or decrease the temperature for the front passenger. If the passenger's climate control system is off, pressing one of these buttons turns it on.

PASS (Passenger's Climate Control): Press this button to turn the passenger's climate control systems on or off. When the passenger's climate control system is on, the passenger's temperature setting is displayed. The temperature selected by the front passenger also controls the rear system air temperature unless the rear seat passengers select their own comfort setting. If the PASS button is pressed to turn the passenger temperature setting off, the driver's temperature knob will control the temperature for the entire vehicle.

AUX: If your vehicle has a rear climate control system, press this button to turn the rear climate control fan on for automatic operation. After the AUX button is pressed, the indicator light comes on. Press the button again to turn the auxiliary fan off. See Rear Climate Control System .

(Air Conditioning): Press the center of the left control knob to override the automatic system and turn the air conditioning system on or off. When in AUTO, the air conditioning compressor comes on automatically, as necessary.

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

Sensors

The solar sensor, located in the defrost grille, middle of the instrument panel, monitors the solar radiation. Do not cover the solar sensor or the system will not work properly.

There is also an interior temperature sensor located next to the steering wheel that measures the temperature of the air inside your vehicle.

There is also an exterior temperature sensor located behind the front grille. This sensor reads the outside air temperature and helps maintain the temperature inside the vehicle. Any cover on the front of the vehicle could cause a false reading in the displayed temperature.

In order to prevent false temperature readings at startup, the displayed temperature will not change until the following occurs:

The climate control system uses the information from these sensors to maintain your comfort setting by adjusting the outlet temperature, fan speed, and the air delivery mode. The system may also supply cooler air to the side of the vehicle facing the sun. The recirculation mode will also be used as needed to maintain cool outlet temperatures.

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 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.

(Floor/Defog): Turn the control to this mode to direct approximately half of the air to the floor outlets and the remaining air is directed to the side window outlets and to the windshield. 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 floor/defog mode.

(Defrost): Turn the control to this mode to direct most of the air to the windshield and the side window outlets. In this mode, the system automatically turns off recirculation and runs the air conditioning compressor, unless the outside temperature is at or below freezing. Recirculation cannot be selected while in the defrost mode. Do not drive the vehicle until all the windows are clear. For professional vehicles, air will be allowed to flow through the rear outlets. For quicker defrost, press the AUX button on the front climate control system so that the light is not lit.

Rear Window Defogger

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

(Rear Defogger): Press the center of the right control to turn the rear window defogger on or off. Be sure to clear as much snow from the rear window as possible. The rear window defogger will turn off approximately 20 minutes after the button is pressed if your vehicle is moving at slower vehicle speeds. At higher vehicle speeds, the rear defogger may stay on continuously. Each additional press will run the defogger for approximately 10 minutes.

The heated outside rearview mirrors will heat to help clear fog or frost from the surface of the mirror when the rear window defogger is on.

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.