GM Service Manual Online
For 1990-2009 cars only

Your vehicle may have a rear heating and air-conditioning system. This system regulates the temperature, the fan speed and the air delivery for the rear-seat passengers only. It also works with the main climate-control system in your vehicle.

Front Climate Control Panel


Object Number: 1921422  Size: B1

Use this control panel when you would like to maintain a separate temperature setting. Adjust the direction of the airflow or adjust the fan speed for the rear seat passenger(s).

Rear Climate Control Panel


Object Number: 1921435  Size: B1

If your vehicle has a 135 inch (343 cm) wheelbase, a rear control panel for this system is located in the second row behind the driver in the rear of your vehicle. A rear seat passenger can use this control panel to personally adjust the temperature, the direction of the airflow and the fan speed for the rear seating area.

The fan knob located on the front climate control panel must be turned to AUX (Auxiliary) to let a rear seat passenger use the control panel in the rear seating area. Performing this action disables the front control panel. To return control to this panel, move the fan knob out of AUX.

(Fan): Turn the left knob clockwise or counterclockwise to increase or decrease the fan speed in the rear-seating area.

This position turns the system off.

Mode Control: Turn the center knob clockwise or counterclockwise to change the direction of the airflow in the rear seating area. To change the current mode, select one of the following:

(Vent): This mode directs air to the upper outlets, with a little air directed to the floor outlets.

(Floor): This mode directs most of the air to the floor outlets.

Temperature Control: Turn the right knob clockwise or counterclockwise to increase or decrease the temperature in the rear-seating area.

The air-conditioning system on the main climate control panel must be turned on to direct cooled air to the rear of the vehicle. If it is not on, then the temperature in the rear of the vehicle remains at cabin temperature.

Be sure to keep the area under the front seats clear of any objects so that the air inside of your vehicle can circulate effectively.

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