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Old 08-16-2013, 01:25 PM   #3
thom4782
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Join Date: Sep 2010
Location: Foster City CA
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If the fan works at high speed after jumping but not at low, the odds are really high the problem is the ballast resistor.

Did you try jumping with the AC on? Fans run at low speed with the AC on regardless of coolant temp. I haven't looked at a wiring diagram to see if jumping bypasses the temperature trigger.
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