Auxiliary Heating and A/C Operations

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

The purpose of the auxiliary heating and A/C system is to supply heat or cool air and remove humidity from the rear interior of the vehicle. The rear auxiliary HVAC system will operate with the ignition in the ON position. The auxiliary HVAC system allows the back seat passengers to adjust the temperature of the rear flow of air. The A/C function is only available to the auxiliary system when the HVAC control module is in A/C mode. When the front auxiliary HVAC control is not set in the rear mode the rear auxiliary HVAC is disabled. For maximum cooling operation of the HVAC system set the rear fan control to 0 or OFF if no rear passengers are present. The rear passengers comfort is achieved by setting the rear fan control to the number 3 setting. Setting the rear blower speed to the R setting will allow the rear passengers to control rear blower and temperature settings.