Front

CIRCUIT DESCRIPTION
In all blower speeds except HI, voltage to the Blower Motor is supplied by the HTR A/C fuse. In HI blower speed, the Blower Motor is supplied by Fusible Link 2 (GRA).

The Blower Motor operates whenever the A/C Heater Select Control is in MAX A/C, NORM A/C, BI-LEVEL, BLEND or DEFROST Voltage through the A/C Heater Select Control is available to the Blower resistors through the 51 (YEL) wire. The current then flows through all three resistors and the normally closed contacts of the HI Blower Relay to the Blower Motor and the Blower Motor runs at very slow speed. With the A/C Heater Select Control in VENT or HEAT no voltage is available to the Blower Motor

With the Blower Switch in LO, current flows from the HTR A/C fuse, through the Blower Switch to the 63 (TAN) wire at the Blower Resistors. Current then flows through two of the resistors and the normally closed contacts of the HI Blower Relay to the Blower Motor. The Blower Motor then runs at Low speed.

With the Blower Switch in MED, the blower operates the same as in LOW Speed, except that the current is directed to the Blower Resistors through the 72 (LT BLU) wire and passes through only one resistor and the Blower Motor runs at slightly faster speed.

With the Blower Switch in HI, current bypasses the Blower Resistors and flows to the HI Blower Relay This current energizes the relay and closes the normally open contacts of the relay This allows current to flow from Fusible Link 2 (GRA) through the relay to the Blower Motor and the Blower Motor runs at High Speed.