Blower Speed Control

The blower switch provides a choice of various blower speeds. The blower switch receives power through a fuse in the fuse block when the power is ON. In the various speed positions, the circuit continues through the heater wiring harness to the blower motor resistor assembly near the blower motor.

The circuit goes from the resistor assembly to the blower motor terminal in order to operate the blower motor.

The blower motor relay provides battery voltage to the blower motor assembly only during high blower motor assembly speed. The blower motor circuit is completed to ground by a wire in the heater wiring harness. The wire goes from the blower motor terminal to a terminal at the dash sheet metal near the blower assembly in the engine compartment.