Blower Motor Switch: Description and Operation
BLOWER SWITCHThe blower switch provides a choice of LOW MEDIUM, and HIGH blower speeds. The blower switch receives power from the fuse block when the ignition switch is in the ON position. If the LOW speed position is selected, the circuit continues through the heater wiring harness to 2 resistors in the resistor assembly near the blower motor.
If the MEDIUM-speed position is selected, the circuit continues through the heater wiring harness to the resistor assembly, but it bypasses 1 of the 2 resistors.
If the HIGH-speed position is selected, the circuit continues through the heater wiring harness to the resistor assembly. However, both resistors are bypassed in order to provide full power to the blower motor.
From the resistor assembly, the circuit continues to the blower motor terminal where the circuit is grounded by a wire in the heater wiring harness. This wire connects to a terminal at the cowl panel sheet metal near the blower assembly in the engine compartment.