Question about 2007 Ford Crown Victoria LX Sedan

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Fan motor works on high

The ac/heater fan motor only works on high.. When in lower setting...if you hit a bump it may only come on for a brief second.

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Really common problem on Fords. My '00 vic had it and my friends 06 mustang had it. The problem is the blower motor gets old and starts drawing too much amperage. The motor is controlled by (on manual HVAC systems) by a nichrome resistor bank located near the heater core. The extra amperage blows the thermo-resistor in the bank, and also does some damage to the corresponding harness. The reason it work's on "HIGH" is because that setting bypasses the bank completely. You can fix the problem pretty easily yourself but it is sort of annoying. First go get a new blower motor, either from Ford or some other place like Napa or autozone. Probably one of the latter because sometimes it seems dealer's aren't always the most cost effective solutions =] Now head on down to Ford and pick up the resistor bank (and most likely the harness, but check if it's burnt first) park your car, let it cool down, and pull off the radiator cap, keeping it on the hole (this keeps the pressure equal, and just set it on the hole so no random stuff gets in) pull off the coolant lines to the heator core, unbolt the resistor bank, set it next to the next new one, and wire up the new harness one wire at a time. plug in the new one, bolt it in, and reinstall the coolant lines. then put in the new blower motor, it should be on the lower passanger side on the engine bay. Now go enjoy your new fan speeds!

Posted on Nov 07, 2008

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