Auxiliary Air Temperature Actuator

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 auxiliary air temperature actuator opens or closes the auxiliary air mixture door to a position to divert sufficient air past the heater core to achieve the desired vehicle temperature. The auxiliary air temperature actuator is a 3 wire actuator that incorporates a bi-directional permanent magnet electric motor.

The auxiliary air temperature actuator receives power from the ignition 3 voltage circuit. Ground is provided by the ground circuit through a splice pack. The control of the air temperature actuator is provided by the auxiliary air temperature door control circuit. The auxiliary HVAC control processor provides a varied 12 volt signal to the actuator. 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. When the voltage signal is low a cool air request is made and the voltage signal is high a warm air request is made.