GM Service Manual Online
For 1990-2009 cars only

Rear Climate Control System Without Entertainment System

Your vehicle may have a rear climate control system that allows the driver to adjust the fan speed or a rear-seat passenger to set a separate temperature and adjust the fan speed, for the rear seating area. This system works with the main climate control system in your vehicle.


Object Number: 808397  Size: A2

This knob is located below the main climate control system on the instrument panel switchbank. Use this knob to adjust the fan speed for the rear seat passengers.


Object Number: 809521  Size: B2

These controls are overhead, on the control panel located behind the driver's seat. A rear seat passenger can use these controls to personally adjust the temperature and the fan speed for the rear seating area.

The fan knob located on the switchbank must be turned to R (Rear) to allow the rear seat passengers to use the controls located on the control panel in the rear seating area. Performing this action disables the fan knob on the switchbank. To return control to that knob, turn the knob out of R.

To direct the airflow to the rear seating area, use the right knob located on the main climate control panel.

    • Select vent or bi-level mode to direct air to the rear of the vehicle through the overhead outlets.
    • Select floor, defog, or defrost mode to direct air to the rear of the vehicle through the floor outlets.

Generally the upper outlets are used for air conditioning and the floor outlets are used for heating.

(Fan): Turn the fan knob on either rear fan control to numeral 1, 2, or 3 to increase or decrease airflow to the rear seating area. Turn the fan knob on either rear fan control to 0 or OFF to turn off the fan.

Temperature Control: If the driver is adjusting the temperature, increase or decrease the temperature for the entire vehicle using the temperature controls located on the main climate control panel. The air-conditioning system must be on to direct cooled air to the rear of the vehicle. If it is not on, the temperature in the rear of the vehicle will remain at cabin temperature. If a rear seat passenger is adjusting the temperature, turn the right knob, located overhead on the control panel behind the driver's seat, clockwise or counterclockwise to raise or lower the temperature in the rear seating area only.

Rear Air Outlets

The outlet behind the left rear seat is the cold air return outlet. Be sure to keep it free from obstructions. Also, keep the area around the base of the center instrument panel console, between and under the front seats, free of objects that could also obstruct airflow to the rear seating area.

For more information on how to use the main climate control system, see Climate Control System . For information on ventilation, see Outlet Adjustment .

Rear Climate Control System With Entertainment System

Your vehicle may have a rear climate control system that allows the driver to adjust the fan speed or a rear seat passenger to set a separate temperature and adjust the fan speed, for the rear seating area. This system works with the main climate control system in your vehicle.


Object Number: 808397  Size: A2

This knob is located below the main climate control system on the instrument panel switchbank. Use this knob to adjust the fan speed for the rear seat passengers.


Object Number: 809520  Size: B1

These controls are overhead, on the control panel located behind the front seats. A rear seat passenger can use these controls to personally adjust the temperature and the fan speed for the rear seating area.

The fan knob located on the switchbank must be turned to R (Rear) to allow the rear seat passengers to use the controls located on the control panel in the rear seating area. If this fan knob is not in R when the FAN or TEMP button is pressed, the rear control panel will show DISABLED.

To direct the airflow to the rear seating area, use the right knob located on the main climate control panel.

    • Select vent or bi-level mode to direct air to the rear of the vehicle through the overhead outlets.
    • Select floor, defog, or defrost mode to direct air to the rear of the vehicle through the floor outlets.

Generally the upper outlets are used for air conditioning and the floor outlets are used for heating.

(Fan): If the driver is adjusting the fan speed, use this control. Turn the fan knob on the rear fan control located below the main climate control system on the switchbank to numeral 1, 2, or 3 to increase or decrease airflow to the rear seating area. Turn the fan knob on the rear fan control to 0 to turn off the fan.

FAN: If a rear-seat passenger is adjusting the fan speed, use this control. Press the FAN button on the rear control panel. The display will show the current setting. Press the left and right arrow buttons to cycle through the available settings of OFF, LOW, MED, and HIGH.

Temperature Control: If the driver is adjusting the temperature, increase or decrease the temperature for the entire vehicle using the temperature controls located on the main climate control panel. The air-conditioning system must be on to direct cooled air to the rear of the vehicle. If it is not on, the temperature in the rear of the vehicle will remain at cabin temperature. If a rear-seat passenger is adjusting the temperature, press the TEMP button on the rear control panel. Use the left arrow button to make the air cooler. Use the right arrow button to make the air warmer.

Rear Air Outlets

The outlet behind the left rear seat is the cold air return outlet. Be sure to keep it free from obstructions. Also, keep the area around the base of the center instrument panel console, between and under the front seats, free of objects that could also obstruct airflow to the rear seating area.

For more information on how to use the main climate control system, see Climate Control System . For information on ventilation, see Outlet Adjustment .