Blower Controls

With the Ignition Switch in "RUN," battery voltage is applied to the Mode Selector. The Mode Selector funnels power to the Blower Switch in all modes but "OFF." With the Blower Switch set to "1," 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 "2" or "3" positions, the operation is similar to the operation in "1" except the resistance through the Blower Resistor Assembly is decreased, causing the Blower Motor to run faster in "2" and even faster in "3." When "4" blower speed is selected, the Blower Switch applies voltage to the Blower Motor Relay coil. The Blower Relay Motor is energized, applying voltage from CKT 2 through the relay directly to the Blower Motor. The Blower Motor then runs at high speed.