With Manual A/C

CIRCUIT OPERATION
The blower motor is a variable speed motor. The higher the voltage applied to the motor the faster the speed. The lower the voltage applied the slower the speed. When the mode selector switch on the A/C control head is in any position but OFF, battery voltage is applied to the blower resistors (terminal A) and the blower switch (terminal D). When the blower switch is in LO, voltage is applied across all of the blower resistors and the blower motor, and the motor runs at its slowest speed. As the blower switch is moved to select a higher speed, the switch allows more voltage to be applied to the blower, increasing its speed. When the blower speed switch is in HI, the blower resistors are bypassed. Battery voltage is applied to the coil of the blower relay to energize the relay. When the relay is energized, Battery voltage is applied directly to the blower motor. The motor will run at its fastest speed.