HVAC Control Module
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The HVAC control module is a non-Class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive and ignition 3 voltage circuits provide power to the HVAC control module. Three integrated potentiometers control air temperature door position and blower motor speed. The integrated vacuum system controls the mode door position. The HVAC control module supports the following features: