HVAC Control Assembly
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
The HVAC control assembly is a non-class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and settings. The battery positive and ignition voltage circuits provide power to the control assembly. Two integrated potentiometers control air temperature door position and blower motor speed. The integrated vacuum system controls the mode door position.