The compressor was supposed to have oil already in it. I assume it has the right amount

No the serpentine belt runs it. I'm not sure about a chain drive but something drives the alternator and the serpentine belt from inside the cover. That's why I removed the alternator to check the coupling and the bolt for the pulley that drives the serpentine belt

I used a stethoscope and probed around all the moving parts. The noise appeared to be coming from the ac comp. So I ordered one and changed it out,only to have the same exact noise. I returned it and put another one on..still has the same noise. I don't see three ac compressors making the same exact...

I have an 07 xc90 3.2. There is a very loud noise coming from under the hood. Noise is there hot or cold and gets louder while driving. I replaced the belt tensioner and idler pulley a couple of months ago because I thought that's what the noise was. Noise still present after I replaced those parts....

Brake lights work fine. I can feel the solenoid clicking in the shifter when I hit the brake. It only happens when it is cold. I have taken the cover off of the shifter and can not see anything wrong. Any help would be appreciated. Thanks

I have an 07 xc90 that wont shift out of park. It only happens when it is cold outside,and after inside of vehicle is warm it operates fine. I havent been able to find any topics on this. Any help would be appreciated!!