Auxiliary A/C Operation -1

When an auxiliary cool air request is made the auxiliary HVAC control processor will send a low voltage signal to the auxiliary air temperature actuator on the auxiliary air temperature door position signal circuit. This voltage signal is a varied 12 volt signal. This signal is monitored by the logic incorporated in the actuator and it will move the actuator in the desired direction when a position change is requested. The signal from the auxiliary HVAC control assemblies to the auxiliary HVAC control processor is a varied 12 volt signal. This signal, when cool air is requested, is a low voltage signal.

Manual Auxiliary HVAC W/CFS Front Auxiliary HVAC Control Assembly
The front auxiliary HVAC control assembly is located in the front headliner. This controller controls all auxiliary HVAC operation. This assembly provides blower, air delivery mode and air temperature settings. This system does not have Class 2 communication available.

The front auxiliary HVAC control assembly receives power from the ignition 3 voltage circuit. Ground is provided by the ground circuit to a splice pack. When the air temperature knob is rotated a variable resistor internal to the assembly will vary a 12 volt input. This 12 volt varied signal is then sent to the auxiliary air temperature actuator for a change in door position. This is done on the auxiliary air temperature door position signal circuit. When the voltage signal is low a cool air request is made and the voltage signal is high a warm air request is made.