Blower Motor: Description and Operation

CIRCUIT OPERATION

The Blower Motor speed is controlled by the Blower Switch in the A/C Control Head. 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.

In High Speed operation the Blower Motor is fed through the contact of the Blower High Speed Relay. when the Blower Switch is in the HI position, battery voltage is supplied through the ORN wire to the coil of the Blower High Speed Relay. The relay is energized and its contacts supply battery voltage directly to the Blower Motor from Fusible Link B (V8 VIN E, V8 VIN F and V8 VIN 8) or Fusible Link G (V6 VIN T). The Blower Motor now runs at maximum speed.

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