Circuit Operation

The Blower Motor circuit employs the following components:
^ Blower Motor
^ Blower Resistor Assembly
^ Blower Motor Relay
^ Heater
- Heater-A/C Control Assembly
- Blower Switch
- Mode Selector

With Ignition Switch in RUN, battery voltage is applied to the Mode Selector. The Mode Selector energizes the Blower Switch when any selection except OFF is made.

With the Blower Switch set to low, battery voltage is applied to the Blower Motor through the Blower Resistor Assembly and the normally closed contacts of the Blower Motor Relay. The Blower Motor runs at low speed. When the Blower Switch is in the II or III position, the operation is similar to the operation in LOW except the resistance through the Blower Resistor Assembly is decreased, causing the Blower Motor to run faster in II and even faster in III. When HIGH blower speed is selected, the Blower Switch applies voltage to the Blower Motor Relay coil. The Blower Motor Relay is energized, applying voltage from CKT 840 through the relay directly to the Blower Motor. The Blower Motor then runs at high speed.