Blower Motor: Description and Operation

Operation
With the ignition switch in run, battery voltage is applied to the selector switch. The selector switch applies battery power to the blower switch in all modes but off. With the blower switch set to lo, battery voltage is applied to the blower motor through the blower resistor. The blower motor will then run at lo speed. When the blower is switch to M1 or M2 positions, there is less resistance applied to the circuit so the blower motor will run faster. When high blower speed is selected, voltage is applied to the blower relay coil. When the relay energizes, full voltage is applied through circuit 202 causing the blower motor to run at full speed.