Circuit Operation

BLOWER CONTROLS

In all blower speeds except HI, the HTR-A/C Fuse supplies voltage to the Blower Motor through the A/C-Heater Selector Switch. In High Speed operation, voltage from the Blower Switch energizes the High Blower Relay, permitting voltage to flow from the Battery Junction Block to the Blower Motor.

BLOWER LOW SPEED OPERATION

With the Blower Switch in LO, voltage flows from the A/C-Heater Selector Switch through the BRN (64) wire, the Blower Switch and TAN (63) wire to the Blower Resistors. The voltage then flows through all three resistors and the normally closed contacts of the High Blower Relay to the Blower Motor causing the Blower Motor to run at Low speed.

BLOWER MEDIUM SPEED OPERATION

With the Blower Switch in MED, voltage flows from the A/C-Heater Selector Switch through the BRN (64) wire to the Blower Switch and the LT BLU (72) to the Blower Resistors. The voltage then flows through two of the resistors and the normally closed contacts of the High Blower Relay to the Blower Motor causing the Blower Motor to run at Medium speed.

BLOWER HIGH SPEED OPERATION

With the Blower Switch in Hi, voltage flows from the A/C Heater Selector Switch through the BRN (64) wire to the Blower Switch and bypasses the Blower Resistors and flows to the High Blower Relay through the ORN (52) wire. This voltage energizes the relay and closes the normally open contacts of the relay. Voltage then flows from the Battery Junction Block, through the relay to the Blower Motor causing the Blower Motor to run at High speed.