Does anyone know or can reccomend an auto a/c repair shop that is capable of fixing the a/c in a vehicle i have. I have had this for over 4 years and noone can diagnose the leak. 3 different places, and myself charged it over the years and it leaks out all the time. It should not leak out. I have replaced every piece on it new in spring 2012 and i still have no ac/ still leaking out. Very disappointing. Thanks.