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Do both fans run at low speed when you run the engine with the AC on so its blowing cold air? If both work at low speed, then the resistors are OK. If one doesn't run at low speed, the ballast resistor probably needs replacing. When the AC is off, the fans run at low or high speed depending on coolant temperature.
If low speed operation is intterment with the AC on, one guess is that the ballast resistor is beginning to fail (crack) and it hasn't reached the point where it fails completely. Once a ballast resistor fails completely, the fan will not run at low speed under any conditions
Last edited by thom4782; 06-29-2013 at 12:34 PM.
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