The heater blower motor reduces or increases ... The fan switch may be at fault, but a more likely reason is that a blower motor resistor that controls the voltage going to the blower has packed ...

The resistor module raises or lowers the current being sent to the blower motor, and the air starts to flow as a soft breeze ...

Adjusting the fan speed sends a signal through a resistor to the blower motor to either pick up the pace or slow it down. The blower motor resistor adjusts the amount of current going to the ...