I have a 2000 xterra with the 2.4 motor. The car had started to make a god awful screeching noise whenever the air conditioner is on but no noise when its off. I figured ok time for a belt.. i changed the belts and the noise continued.. i changed the tensioner pulley for the AC belt and the noise continued.. i changed the compressor with a new clutch and the damn noise continues.. now I have no idea what can be causing this noise.. i thought maybe the crankshaft pulley because thats the only other thing the belt touches. But wouldn't the screeching noise continue regardless if the AC is on or off? The nlise is so damn loud i can't trace it, best I can do is I know its coming from the general area of the compressor which doesn't say much cus everything is right there.. help me out guys, what the hell is this or at least point me in a better direction.. thanks!