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Why is there a knocking noise when the a/c is on?

(2008 Nissan Altima)
in Sanford, FL on August 22, 2013
You only hear the knocking noise from time to time and it is only when you come to a complete stop. You turn the a/c off and the noise stops.
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Popular Answer
of Greg's Orange Auto on August 22, 2013
poss compressor is going bad due to lack of oil,have it ck"d
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