Air Speed - Auxiliary Control: Notes

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

The auxiliary HVAC system provides heating and cooling to the rear of the vehicle. There are two types of systems, a Rear Video/Audio/HVAC (RVAC) system and a base auxiliary HVAC system. The only difference between the RVAC and the base model are the switches and internal wiring. The RVAC module has toggle type switches and the base model has rotary type switches. The system is controlled by the HVAC control module, auxiliary blower motor switch and auxiliary HVAC control/RVAC module. The auxiliary HVAC system can be operated whenever the ignition switch is in the ON position. Auxiliary A/C can only be operated when the HVAC control module is in A/C mode.

Power is provided to the auxiliary blower motor from the ignition 3 voltage circuit from the fuse block. Power and ground are provided to the HVAC control module by the ignition 3 voltage and the ground circuits.