A heater blower resistor is a component of a vehicle’s heating and ventilation system that regulates the speed of the blower motor. It is typically located in the passenger compartment, behind the dashboard. When the heater or air conditioning is turned on, the resistor reduces the voltage to the blower motor, allowing it to operate at a lower speed.
Heater blower resistors can fail over time, causing the blower motor to operate at a higher speed than normal. This can lead to increased noise and wear on the blower motor, and can also reduce the efficiency of the heating and cooling system.
