Blower Motor: Description and Operation

CIRCUIT OPERATION
The Blower Motor speed is controlled by the Blower Switch in the Heater-A/C Control Assembly. With the switch in the LO position, all of the Blower Resistors are in the circuit with the motor so that it runs slowly. In the M1 and M2 positions, the Blower Switch bypasses some of the resistors, increasing the motor speed.

The Blower Motor is fed through the contacts of the Blower Relay. When the Blower Switch is in the HI position, battery voltage is supplied through the ORN wire to the coil of the Blower Relay. The relay is energized and its contacts supply battery voltage directly to the Blower Motor from the Fusible Link.

When the Mode Selector is in the OFF position, no voltage is applied to the Blower Switch and Blower Motor, so the Blower does not run. In all other positions, the Blower will operate as described.