Bonneville V6-3800 3.8L VIN L SFI (1995)
Control Module HVAC: Description and Operation
Blower Control Module
DESCRIPTION
The Blower Control Module is a solid state device that operates the blower motor. The Blower Control Module outputs a voltage that varies between
0 volts (blower motor OFF) and 12 volts (maximum blower motor speed).
OPERATION
To determine the appropriate output voltage, the Blower Control Module monitors a varying voltage signal (between about 2 and 8 volts) from the
Heating Ventilation and Air Conditioning (HVAC) programmer. The module then amplifies the signal and applies voltage directly to the blower
motor. Blower Control Module output voltage is also monitored by the HVAC programmer.
