Silhouette V6-191 3.1L VIN D TBI (1995)
Blower Motor: Description and Operation
Main Blower Motor
CIRCUIT OPERATION
The Blower Motor is a variable speed motor. The higher the voltage applied to the motor, the faster the speed.
With the Ignition Switch in "RUN" and the Heater Control Assembly in "OFF," voltage is applied to the Blower Motor Low Speed Relay coil. The
relay is energized and voltage to the Blower Switch is removed. No voltage is supplied to the Blower Motor.
When any other mode except "OFF" is selected, the Blower Motor Low Speed Relay is de-energized and voltage is applied to the Blower Switch and
Blower Motor Resistor.
With the Blower Switch in "LO," voltage is applied through the Blower Motor Resistor and the Blower Motor High Speed Relay to the Blower
Motor. The Blower Motor runs at low speed.
As the Blower Switch is moved through positions "M1" and "M2", the switch bypasses part of the Blower Motor Resistor, allowing more voltage to
be applied to the Blower Motor, which will increase its speed.
When the Blower Motor Switch is in "HI," voltage is applied to the coil of the Blower Motor High Speed Relay. The Blower Motor High Speed
Relay is energized removing the Blower Motor Resistor from the circuit. Battery voltage is then applied directly to the Blower Motor through the
Blower Motor High Speed Relay contacts. The motor runs at maximum speed.
