Why is there a knocking noise when the a/c is on? on 2008 Nissan Altima

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.

by in Sanford, FL on August 22, 2013
1 answer
ANSWER by , August 22, 2013
poss compressor is going bad due to lack of oil,have it ck"d