Electra V6-231 3.8L VIN C SFI (1988)
Blower Motor: Description and Operation
Automatic Climate Controls
DESCRIPTION
The speed of the Blower Motor is determined by the voltage applied to the motor. At low Blower Motor speeds the applied voltage is about 4 volts.
As the voltage is increased, the Blower Motor speed increases until maximum Blower speed is reached at 12 volts.
OPERATION
The speed at which the blower is to run is determined by the Heater and A/C Control Assembly from temperature signal inputs and the operating mode
of the Air Conditioning System. The Heater and A/C Control Assembly accepts input requests from driver via the front panel push-buttons.
The blower speed output from the Heater and A/C Control Assembly is output at terminal K and is a continuously variable voltage proportional to
blower speed. At minimum blower speed the output is 2 to 3 volts and at maximum blower speed it is 7 to 10 volts.
The output speed signal from terminal K is input to the Bower Control Module at terminal B on connector C2. An amplifier and driver circuit in the
Blower Control Module supplies a voltage between 4 and 12 volts to the Blower Motor according to the input signal at terminal B.
The voltage at the Blower Motor is fed back to the Heater and A/C Control Assembly at terminal L to allow precise speed control of the blower by the
circuits in the Heater and A/C Control Assembly.
