Car Heater Fan Only Runs On High

If it doesn t light up or you only have a high fan speed then your resistor block needs replacement since it is bypassed on high speed. It means that when it only worked on high that the resistor in the blower fan wiring went bad and the only speed the fan would run on would be a speed where no resistor was being used which is. My heater and ac fan only works on high when i turn my switch on for the fan on the heater and ac it only works on full blast.

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The fan in your car stopped working except when set to the highest setting.

Car heater fan only runs on high.

If the resistor block tests out good and you don t have any fan speed or a slow fan speed for all speeds you can assume that the blower motor is at fault since everything else has tested out ok. You tried turning on the ac and the different climate controls and it s the same. Though having only one fan speed usually indicates a bad blower resistor a diligent mechanic at a repair shop will test the resistor fan switch and connections to the motor to make sure nothing.

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