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.
Wednesday, April 29th, 2009 AT 6:01 PM