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How to Replace Install a Blower Motor Resistor

A blower motor takes still air and forces it in one direction. In cars, theyre an essential part of the air conditioner because they blow air through an evaporator and into the cabin. Blower motors can move air at different speeds by switching between different resistances. Resistors with low impedance let the motor spin faster and high impedances make it spin slower. A short circuit can damage the resistors in your blower motor and the only way to fix them is to replace them.

Instructions

1

Disassemble your blower motor and expose the electronics inside.

2

Inspect the resistors in your blower motor. They are either a small coil with electrical connections or are a removable part of an integrated circuit board. Damaged resistors may appear and smell burnt, or look melted.

3

Remove the screws holding the resistor to the board, then remove the resistor from the motor.

4

Insert the replacement resistor in the same place as the old one and secure it with screws. Ensure that no stray wires or connections are touching the resistor.