A/C Mode - Auxiliary

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 premium rear seat audio / video (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. The optional auxiliary HVAC system allows the back seat passenger to adjust the temperature of the air directed to the rear of the vehicle using the auxiliary temperature switch. A/C is only available when the HVAC control module is in A/C mode. The fuse block provides power to the auxiliary air temperature actuator through the ignition 3 voltage circuit. When a desired temperature setting is selected, a signal is sent from the auxiliary HVAC control module to the auxiliary air temperature actuator through the auxiliary air temperature door control circuit. When the logic receives the signal, the auxiliary air temperature actuator moves the temperature door to a position to divert sufficient air past the heater core to achieve the desired vehicle temperature. Ground is provided by the ground circuit, the rear auxiliary HVAC is disabled When the front auxiliary HVAC control is not set in the Rear mode the rear auxiliary HVAC is disabled.