GM Service Manual Online
For 1990-2009 cars only

To operate the rear air conditioning system, the front air conditioning system must be on. With the front air conditioning system off, the rear system controls can only be used to circulate air in the rear of the vehicle.

To adjust the airflow speed, turn the fan knob (driver override switch), located on the floor console to 1,2 or 3. The rear mode and temperature position will now mimic the front control system mode and passenger side temperature.


Object Number: 854267  Size: A3
(Panel): When panel mode is selected in the front controller, the rear system will distribute air from the four headliner outlets.

(Bi-level): When bi-level mode is selected in the front controller, the rear system will distribute air from the four headliner outlets and the third seat floor outlet.

(Floor): When floor mode is selected in the front controller, the rear system will distribute air from the third seat floor outlet. The front system will distribute some air to the console floor outlet in the second row.

(Defog): When defog mode is selected in the front controller, the rear system will distribute air from the third seat floor outlet.

(Defrost): When defrost mode is selected in the front controller, the rear system will distribute air from the third seat floor outlet.

To activate the second row seat controls in the following systems, set the fan knob, located on the front console, to R.

Your vehicle has one of the following rear climate control systems.


Object Number: 854263  Size: B4

Turn the knobs on the control panel to choose a fan speed, temperature and direction of airflow.

Selecting panel mode will deliver air to the four headliner outlets. Selecting bi-level mode will deliver warmer air to the third seat floor outlet and cooler air to the headliner outlets. Selecting floor mode will deliver air to the floor outlet located in the third seat area.


Object Number: 854270  Size: B4

Press the buttons at the bottom of the audio control panel to adjust the fan speed, mode and temperature for the rear passengers. The selections will be shown on the display.

Press the rear fan control button with the arrow pointing right to turn the rear climate control on. Toggle this button to adjust the air flow speed. To turn the rear system off, toggle the left arrow until the display turns off.