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noise is coming I dont know if it is a/c compressor or alternator

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what type of car/truck? does it change when a/c is turned on?

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carfully put a long screw driver point on the a/c compressor and put your ear on the end of the handle and it will amplify the noise - do the same to the alternator and you should be able to identify which one is making the noise.

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Thanks for the answer I will check it right now

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