I have an 02 2500 Avalanche and this summer my A/C hasn?t been working the way it should. About a year and half ago I replaced the compressor because it failed. It worked perfect and was ice cold all the way up till this summer. Now it will blow cold air in the morning but in the afternoon it will blow warm air especially sitting in traffic. Even driving at 60+ mph in the afternoon it doesn?t get cold. It?s cooler then it is during traffic but not even close to the way it used to be. Does anyone have any suggestions?