Cargo Van Rear Temperature and Mode Controls

The Cargo Van's auxiliary A/C air delivery and temperature controls are controlled from a single Rear Auxiliary HVAC Control Module located over the Instrument Panel. Both temperature and mode control capability is provided for the circulating inside air. The Rear Auxiliary Mode Valve directs the circulating air either through overhead vents or through lower vents located along the left side of the rear compartment. The Rear Auxiliary Temperature Valve directs air flow either through or around the heater core in the rear auxiliary ventilation system.

The positions of both valves are controlled by electric motors. Both the Rear Auxiliary Mode Valve and Seal Assembly and the Rear Auxiliary Temperature Valve Assembly have operating voltage applied through the BRN (341) from RR HVAC Fuse 24. This voltage is available only when the Ignition Switch is in START or RUN. Both valve assemblies are grounded through the BLK (150) wire to Ground G400. Each valve assembly positions in response to a voltage signal received from the Rear Auxiliary HVAC Control Module. The Rear Auxiliary Mode Valve and Seal Assembly receives it's positioning voltage signal through the LT BLU (733) wire. The Rear Auxiliary Temperature Valve Assembly receives it's positioning voltage signal through the DK GRN (734) wire.

The Rear Auxiliary HVAC Control Module is also powered from RR HVAC Fuse 24 through the BRN (341) wire. It also is grounded through the BLK (150) wire to Ground G401. In the control module, current flows to ground through two parallel rheostats. The wiper arm of one rheostat is moved by the temperature control dial. The wiper of the second rheostat is controlled by the mode control dial. The wipers select a portion of the voltage dropped across each resistance. This voltage is delivered to the connected actuator motor to position the valve.