The resistor is used to select the fan operation mode. It has two spirals with a resistance of 0.23 and 0.82 ohms. By turning the knob on the heater control panel, you can turn on the engine power circuit or both coils (1st speed) or a coil with a resistance of 0.23 ohm (2nd speed) or turn on the motor directly without a resistor (3rd speed).
1. Loosen the resistor mounting screw.
2. Remove the resistor from the heater housing. If the resistor coils are burned out, replace it.