Though having only one fan speed usually indicates a bad blower resistor, diligent mechanics will test the resistor, fan switch and connections to the blower motor to make sure before they start ...
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Why Does Your Car Heater Only Work on One Speed?The speed fan switch then directs the voltage to the resistor module. Depending on the amount of air you want coming from the ducts, usually there are four speeds to choose from. The resistor module ...
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