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My SL2 has 174K miles on it;I notice a ticking or rattling noise when I engage

(1999 Saturn SL2)
in Virginia Beach, VA on August 09, 2011
the AC unit it vibrates a little then stops is there some component or the system that may cause this start up noise
is it expensive to have it checked?
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Popular Answer
When the a/c is turned on the compressor switches on, runs until the selected coolness of temperature is achieved and then it switches off. Compressor may be bad, compressor clutch may be going bad or refrigerant may be low. It's hard to say if the noise is abnormal without hearing it and being able to do basic diagnostic tests.
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