The blower motor resistor is a small, electrical device that is used to control the speed of the blower motor in a car's heating and air conditioning system. It is typically located in the engine compartment, near the blower motor.
The blower motor resistor works by varying the amount of resistance in the circuit between the blower motor and the battery. When the resistance is high, the blower motor will run at a low speed. When the resistance is low, the blower motor will run at a high speed.
The blower motor resistor is controlled by the climate control system in the car. When the driver changes the fan speed setting, the climate control system will send a signal to the blower motor resistor, which will then adjust the resistance in the circuit and change the speed of the blower motor.
