Blower Motor Switch: Description and Operation
BLOWER MOTOR SWITCHThe blower motor switch controls the blower motor speed and enables the A/C request button. When the blower is set to HI, the blower motor switch provides a direct ground for the blower motor, resulting in HI blower speed. When LO, MED LO or MED HI blower is selected the blower motor switch directs the blower motor ground through the blower motor resistor.