I've notices a rattling noise when the AC is on that sounds like its coming from the compressor area. I just replaced the belt yesterday cuz it busted on me but not sure if that fixed the problem yet (FYI: the sound was heard before the belt busted). Does anybody have a clue to what it could possibly be? Also, sometimes when I start the car and try to put it into reverse it doesn't let me press in the button tocome out of park. I have to put my foot under the brake pedal and pull back on it and then press the brake pedal again and then it works. Doesn't anybody else know of this problem or what it could possibly be caused by?

 

It's kinda hard for us to hear the rattle your hearing from where we sit. But it "could" be the tensioner, the compressor, or any other moving part under the hood.