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Old 12-30-2012, 09:05 AM   #5
thom4782
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Join Date: Sep 2010
Location: Foster City CA
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If the fan doesn't operate in high or low speed after using the durametric, then you may have a electrical circuit problem or a broken fan motor.

By jumping the fan itself with a second 12 volt source (san rensho's suggestion) which takes the car's electrical circuit out of the picture, you can tell if the motor is operating. If the motor works, then the problem is in the wires.
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