General Description

The purpose of the optional auxiliary heater is to supply heat to the vehicle's rear interior. The vehicle operator or passengers can determine the level of warm air in the rear of the vehicle by turning the temperature control on the front or rear HVAC control assemblies. The auxiliary air temperature actuator movement is based on a 5-volt reference signal. This signal is sent from the rear auxiliary HVAC control assembly on the 5-volt reference circuit. When a desired temperature setting is selected, weather manually or automatic, a variable resistor is used to determine the auxiliary air temperature door position sensor signal. That varied 5-volt reference signal is sent back to the rear auxiliary HVAC control assembly on the auxiliary air temperature door position sensor signal circuit. The rear auxiliary HVAC control assembly uses this reference voltage to determine the auxiliary air temperature actuator position through the auxiliary air temperature door position signal circuit. The motor opens the air mixture door to a position to achieve or maintain a desired temperature.

Power is provided to the rear auxiliary HVAC control assembly and the auxiliary air temperature actuator by the ignition 3 voltage circuit. Ground is provided on the ground circuits back through the rear auxiliary HVAC control assembly, and a splice pack.