Anyway, I was installing a CD player for a friend yesterday when I heard a loud sound. I was completely on the other side of the house so I got out and followed the noise. I followed all the way to the outside A/C unit. The noise sounded just like as if you unscrewed the valve stem out of a tire full of air. It was that loud, I knew it was the freon/refrigerant coming out so I was already mad. I tried to take it apart to feel for the leak but I wasnt fast enough, it was all leaked out by the time I got in there. It sounded like it came from the condensor coil area, most of that is hidden. This must be a big leak though. It had been working fine and I know it was just turned on for the first time that day, my wife just turned it on. I depressed both shrader valves in and theres no pressure left, nothing. The unit is an energy efficient Carrier. Doesnt look too old. Model number is 38BYCO36348. Any common places I can check? It seems like something came completely apart or unscrewed. Im gonna take a big hit if I have to spend 2 or $3,000 dollars for a new unit. Ive fixed this unit atleast once every year from the start capacitor to the contactors but this is a bigger job so I need to ask advice first. Thanks guys!