A heater blower resistor is a element of a car’s heating and air flow system that regulates the pace of the blower motor. It’s usually positioned within the passenger compartment, behind the dashboard. When the heater or air-con is turned on, the resistor reduces the voltage to the blower motor, permitting it to function at a decrease pace.
Heater blower resistors can fail over time, inflicting the blower motor to function at a better pace than regular. This may result in elevated noise and put on on the blower motor, and also can cut back the effectivity of the heating and cooling system.