The blower motor resistor is important because it is a device that controls the speed of the blower motor.
Blower motor resistor conceptThe blower motor is a fan housed in the heating, ventilation, and HVAC duct, where it is positioned behind the glove box. This component helps circulate air into the interior cabin to guarantee that you and the passengers are comfortable. The resistor functions by controlling the speed of the air conditioning and heating. It is a source of power for the fan, so when the fan receives less power it causes it to go slow and more power allows it to speed up.
Common issues with a faulty blower motor resistorA faulty blower motor resistor can cause the loss of HVAC fan control, a decline in airflow, and irregular fan speed.