Question about 2003 Chevrolet Impala

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Check engine light was on and car running hot when idling and sometimes while driving. Had fuse replaced did not fix problem, then had fan assembly replaced. Check engine light came on again, running hot while idling. When car heats up right fan goes off but will come back on when turn A/C on but A/C not cool when idling. I have two mechanics telling me fan assembly needs replacing again (its just been 3-4 months) and another shop telling me its a computer/circuit problem. What do I do, I really think its a computer/circuit problem, but mechanics aren't letting car run long enough to observe the problem. Please help

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  • karl kuhn Mar 22, 2012

    If the fan comes on with the a/c you have a bad fan sensor

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If the fan goes on with the a/c then the fans relay is bad

Posted on Mar 22, 2012

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Try replacing the ThermoStat

Posted on Jun 24, 2009

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Sounds like Clutch in your fan

The coolant level is right on, no hoses are leaking and the accessory belt is intact. You start the engine, let it idle and make a visual inspection. There's no sign of belt slippage.
If your car is like most, the cooling fan is mounted to its drive pulley via a clutch. Clutch fans operate at different speeds under different conditions to help reduce drain on the engine and to save fuel. When the engine is hot, the clutch fan runs nearly as fast as the engine. When the engine is cold, the fan runs much more slowly.
The fan clutch operation is regulated by a valve that is opened and closed by a thermostatic spring. The valve controls the flow of a viscous silicone fluid between chambers in the clutch assembly. When the engine is cold, the clutch is essentially disengaged, which is why the fan runs at its slowest compared to the engine's speed. As the engine warms up, the air flowing to the fan assembly becomes hotter. The hotter air causes the thermostatic spring to unwind and open the valve. Silicone fluid from the reservoir chamber flows into the main chamber, engaging the clutch, and the fan spins faster (though it's still slightly slower than the engine.

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