GM Service Manual Online
For 1990-2009 cars only

The heating, cooling, and ventilation for the vehicle can be controlled with this system. For vehicles with the remote start feature, the climate control system will turn on with a remote start. See Remote Vehicle Start.


Object Number: 1974370  Size: G8
  1. Rear Window Defogger

  2. Defrost

  3. Fan Control

  4. Air Delivery Mode Control

  5. Air Conditioning

  6. EXT TEMP

  7. ZONE

  8. Recirculation

  9. AUTO

  10. Power

(OFF): Press to turn the climate control system off. Press any button to turn the system on again. While the climate control system is off the recirculation and rear window defogger can still be turned on.

Automatic Operation

AUTO (Automatic): When this button is pressed, the system automatically controls the inside temperature, the air delivery mode, the air conditioning compressor, and the fan speed. When AUTO appears in the display, the system is in full automatic operation. If any of the controls are manually adjusted, the AUTO indicator turns off in the display.

  1. Press the AUTO button, if the AUTO indicator does not appear on the display.
  2. Adjust the temperature to a comfortable setting between 72°F (22°C) and 75°F (24°C). Choosing the coldest or warmest temperature setting will not cause the system to heat or cool any faster.
  3. Let the system stabilize for a few minutes.
  4. Adjust the air outlets or temperature.

In cold weather, the system starts in the recirculation mode with the fan off. As the engine warms up, warm air is directed to the floor outlets, before automatically changing to bi-level mode with a reduced fan speed.

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.

Manual Operation

+ - (Fan Control): Press + or - to increase or decrease the fan speed. The fan speed and indicator appears in the display. The climate control system sets the fan speed automatically. When the fan speed is adjusted the system goes into semi-automatic operation. Press the AUTO button to return to automatic operation.

Temperature Control: The temperature can be adjusted separately for the driver and the passenger. Turn the temperature controls clockwise or counterclockwise to increase or decrease the temperature. The temperature can be set between 63°F (17°C) and 176°F (30°C). A setting between 72°F (22°C) and 75°F (24°C) is recommended. The temperature settings for each side are shown in the display. If the temperature control is past 86°F (30°C), the display shows H (hottest). Turning it past 63°F (17°C), shows C (coolest). The EXT TEMP (Exterior Temperature) can be displayed in Fahrenheit (°F) or Celsius (°C). See DIC Vehicle Customization.

ZONE: Press to set the climate control to single-zone (SZ) mode or dual-zone (DZ) mode. SZ or DZ appears in the display when a mode is set.

Single-Zone (SZ) Mode: All zones are set to the same temperature. The temperature is shown in the display. Turn the ZONE control to set the temperature.

Dual-Zone (DZ) Mode: Allows different temperatures to be set for the driver and passenger sides or to link them. When linked, the passenger side temperature uses the same temperature setting as the driver side. Turn the AUTO control to set a different temperature for the passenger. Press and hold the AUTO button for at least three seconds to link the passenger and driver side temperatures. Linking automatically occurs if the passenger and driver sides are set to the same temperature when the ignition is turned on.

(Air Delivery Mode Control): Press to change the current airflow mode. The current mode selection appears in the display screen. Changing the mode cancels the automatic operation and the system goes into semi-automatic operation. Press AUTO to return to automatic operation. Select from the following:

(Vent): Air is directed to the instrument panel outlets.

(Bi-Level): Air is divided between the instrument panel outlets and the floor outlets. Cooler air is directed to the upper outlets and warmer air to the floor outlets.

(Floor): Air is directed to the floor outlets with some air directed to the outer instrument panel, windshield and side window outlets.

(Defog): Air is directed to the windshield, floor and side window outlets. Use this mode to clear the windows of fog or moisture and warm the passengers.

(Defrost): Press to turn the defrost on or off. The indicator appears in the display. A portion of the air is directed to the windshield, with some air directed to the side window vents. When defrost is selected, the air conditioning turns on automatically to improve defrosting performance. In this mode the air conditioning cannot be turned off and the recirculation mode cannot be turned on.

Air Conditioning

(Air Conditioning): Press to turn the air conditioning system on or off. The appears in the display when the air conditioning is on. When the air conditioning is turned off OFF appears in the display. The air conditioning cannot be turned off in defrost mode. If is pressed, the indicator light flashes three times and the air conditioning stays on. For quick cool down on hot days, open the windows to let the hot air to escape. After a few minutes, close the windows so the system will work more effectively. The air conditioning system removes moisture from the air, so a small amount of water might drip under the vehicle while idling or after turning off the engine. This is normal. The air conditioning might automatically turn off during heavy acceleration or towing with your vehicle, but the will still display.

Recirculation

(Recirculation): Press to change the air intake between recirculated air and outside air. An indicator light comes when the recirculation is activated. The recirculation mode recycles interior air and is not recommended for extended use. If it is used for a long period of time, the system automatically lets some fresh air into the vehicle for ventilation. Do not use the recirculation mode if occupants are smoking. The recirculation mode cannot be turned on in defrost mode. If is pressed, the indicator light flashes three times and recirculation stays off.

Pollution Mode: Press and hold the button for four seconds to turn the pollution mode on or off. When it is activated, Pollution Mode Activated appears in the display. When it is turned off, Pollution Mode Inactive appears in the display. This mode can be set when the vehicle speed is less than 9 mph (15 km/h). Recirculation will automatically turn on to help prevent exhaust fumes from entering the vehicle in slow moving traffic.

Rear Window Defogger

The rear window defogger uses a warming grid to remove fog or frost from the rear window. It only works when the ignition is in ON/RUN.

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

(Rear Window Defogger): Press to turn the rear window defogger on or off. The indicator appears in the display. The rear window defogger turns off automatically if it is left on.

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.

EXT TEMP

EXT TEMP (Exterior Temperature): Press EXT TEMP to show the temperature outside the vehicle or the normal display. Pressing any other climate control button will change the display from showing the outside temperature to showing the normal display. The units for the EXT TEMP can be displayed in °F or °C. See DIC Vehicle Customization.

Sensors

The climate control system uses three different sensors to maintain the desired temperature. The solar sensor is located on the instrument panel, near the windshield. The interior temperature sensor is located on the instrument panel near the steering wheel and the outside temperature sensor is in front of the radiator.

By monitoring the solar radiation, the air inside the vehicle and air moving across the outside sensor, the selected temperature can be maintained while using the AUTO mode by adjusting the temperature, fan speed, and air delivery system. The system may also supply cooler air to the side of the vehicle facing the sun. The recirculation mode will also be activated, as necessary. Do not cover the sensors or the automatic climate control system will not work properly.

Remote Start Climate Control Operation

For vehicles with the remote start feature and it is activated, the climate control system will automatically set the temperature to 73°F (23°C).

When the ignition is turned to ON/RUN the climate control system heats and cools the inside of the vehicle using the modes that were set before the vehicle was turned off.

Personal Identity Keys

For vehicles with the Personal Identity Key Locking System, the system remembers the last climate control settings used with different keys.

When the unlock button is pressed, the system remembers the key and sets the climate control system to the last settings used with that key. See Remote Keyless Entry (RKE) System Operation.

Passenger Compartment Air Filter

The vehicle has a passenger compartment air filter that filters the outside air entering the vehicle. The filter removes contaminants, such as pollen and dust. See your dealer/retailer for more information.