Control Assembly, HVAC

Chevrolet:

Pontiac:

The HVAC control head used three knobs and one push button in order to control the following features:

^ The air delivery
^ The air temperature
^ The blower motor speed
^ The rear defrost

Temperature Control Knob

The temperature control knob regulated the HVAC system air temperature. Turning the knob to the RH increases the air temperature. Turning the knob to the LH will decrease the air temperature. The temperature control knob is located in the center of the HVAC control head. The temperature control knob is mechanically linked to the air temperature valve (door) by temperature control cable.

Mode Control Knob

The mode control knob is located on the right side of the HVAC control head. The following are the eight different modes to choose from:

^ OFF
^ MAX
^ A/C
^ BI-LEVEL A/C
^ VENT
^ HEATER
^ DEFROST/BLEND
^ DEFROST