Blower Control

The Blower Motor is a variable speed motor. The higher the voltage applied to the motor, the faster the speed.

With the Heater and A/C Control Head in "OFF," voltage is applied to the Low Blower Relay coil. The relay is energized and voltage to the Blower Switch is removed. No voltage is suppled to the Blower Motor.

When any other mode except "OFF" is selected, the Low Blower Relay is de-energized and voltage is applied to the Blower Switch and Blower Motor Resistors.

With the Blower Switch in "LO," voltage is applied through the Blower Motor Resistors and the High Blower Relay to the Blower Motor. The Blower Motor runs at low speed.

As the Blower Switch is moved through positions "M1" and "M2", the switch bypasses part of the Blower Motor Resistors, allowing more voltage to be applied to the Blower Motor, which will increase its speed.

When the Blower Motor Switch is in "HI," voltage is applied to the coil of the High Blower Relay is energized, removing the Blower Motor Resistors from the circuit. Battery voltage is then applied directly to the Blower Motor through the High Blower Relay contacts. The motor runs at maximum speed.