Grand Prix V6-191 3.1L (1989)
Blower Motor: Description and Operation
The Blower Motor is a variable speed motor. The higher the voltage applied to the motor, the faster the speed.
With the Heater And A/C Control Assembly in OFF, voltage is applied to the Low Blower Relay coil through the YEL (770) wire. The relay operates,
its contacts open, and voltage to the Blower Switch is removed.
When any other mode except OFF is selected, the Low Blower Relay is de-energized and voltage is applied to the Blower Switch and Blower
Resistors.
With the Blower Switch in LO, voltage is applied through all three Blower Resistors to the relay contacts in the High Blower Relay and the Blower
Motor. The Blower Motor runs at low speed.
As the Blower Switch is moved through positions M1 and M2, the switch bypasses some of the Blower Resistors, 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 through the ORN (52) wire to the coil of the High Blower Relay. The High Blower Relay
operates, removing the Blower Resistors from the circuit. Battery voltage is then applied directly to the Blower Motor through the Blower Relay
contacts. The motor runs at maximum speed.
