Birdman, yes the hiss starts and stops when the car cycles, but it's more predominant when the ac is started. Flyboy, I noticed that the outside fan in front of the radiator does not come on when I turn the ac on or turn it off. I do not know if this has something to do with the problem. I recently came from walmart and purchased my own recharge kit, do I just plug and play has anyone come accross any problems doing this and is there a meter to know if you are low in freon. Thanks guys this is why I love this place.