Pontiac Problems? Ask a Mechanic for Answers ASAP
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If this was the engine coolant temp sensor you disconnected and the fan came on but the fan shut off with it connected even with high engine temperatures in allot of cases this can indicate the engine coolant temp sensor is at fault here needing replaced.I have seen the engine coolant temp sensor fail in the past before like this here needing replaced.I suspect the fuses and relays are all o.k. as well as the computer control as the fan did kick on with the sensor unplugged.
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