fan control speed only works on high

Asked by Feb 01, 2015 at 11:02 PM about the 2007 Ford Five Hundred SEL

Question type: Maintenance & Repair

Does not blow on 1 2 or 3 only on 4

2 Answers

23,755

Bad blower motor resistor (aka 'thermosistor'). The resistor pack sits on top of the blower motor itself, it decreases the voltage that reaches the motor based on your speed selection. At high, full voltage is applied to the motor (bypassing the resistors) which is why it works on the high setting and not the lower settings. It's about a $30 part, and is easy to swap out, by dropping the glovebox door all the way and reaching up to the blower motor, detaching the wiring harness, and unscrewing the resistor pack and popping in the new one.

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50

need to know location of blower fuse?

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