Hello, I also have the same issue on my 05 altima. I have replaced the compressor along with the tensioner, belt (twice), the motor mount, and serviced the fuel injectors. If your compressor does not make any noise while its operating, I would not change it. A mechanic has advised me that since the noise occurs only while its on drive or reverse, it might be the torque converter which is the transmission.
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Wednesday, April 29th, 2009 AT 6:01 PM