Front Auxiliary HVAC Control Assembly

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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 when the voltage signal is high a warm air request is made.