HVAC Control Assembly

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. See Fig 1.

Fig 1: A/C-Heater Control Panel Functions (Blazer, Jimmy Canadian, Sonoma & S10 Pickup)

Courtesy of GENERAL MOTORS CORP.