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2005 f150 heater fan

nitro640

By nitro640
in Automotive Information Sharing

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Jeremy airjer W Grand Master

Jeremy airjer W

Posted
Posted

You likely have a bad blower motor resistor. Speed one requires all the resistors to drop voltage to the blower motor to get the lowest speed. Speed two requires one less resistor, speed three one less, etc. The speed two resistor has likely burnt out. Since speed one and speed two rely on that resistor both of those speeds stopped working.

The blower motor resistor is readily available at your local parts store. It will be located under the passenger side of the dash near the blower motor itself.

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