HVAC Control Module
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The HVAC control module is powered up by the ignition 3 voltage circuit. When the air temperature switch is rotated a variable resister in the HVAC control module changes the voltage on the air temperature door control circuit for an actuator position change. The module does not utilize keep alive memory (KAM). The module does not have Class 2 communication, personalization and programming available.