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When the car is running, the pulley wheel spins, but the flywheel plate attached to the outside does not. There is a loud rattle from the washer plate between the fly wheel and the pulley wheel because it is trying to spin with the pulley wheel. Should they all spin together? What is the potential damage to the engine?

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I think that you're talking about the A/C compressor pulley and clutch assembly, in which case, they should only spin together when the A/C system comands that the clutch be engaged so that the system can cool the car. If they are noisy, it's because the bearing on the shaft of the compressor clutch has worn out. You can either have the bearing replaced, or the whole compressor as an assembly. This must be done by a professional as you require very specialized equipment. Some people elect to just remove the pump and go without the A/C but this usually requires at dummy pulley and bracket that came with cars that were not equipped with A/C from the factory.

Posted on Apr 03, 2011


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