Has anyone had a problem with the A/C system in there Silverados? Mine is a 2004 CrewCab 1500 with the 5.3 Ive had the tensionner, belt and compressor replaced on warranty once. Started acting up again, took it in and was told that the Engineers a GM were working on it and didnt have a solution to the problem for now... just wondering if I am alone with this one?