Well, it starting to get a bit warmer now and my air conditioning problems have returned. After driving for about 30 minutes, the AC stopped blowing cold air. If I shut it off for awhile, it will start blowing cold again. Apparently, there are no leaks and the freon is charged. There is no evidence that the belt is slipping. The Mercedes dealer couldn't diagnose the problem last summer because it worked perfectly while the car was in the shop.In October, in Florida ,an AC specialist diagnosed a bad relay...cost me $400.00 and it stopped blowing cold air after an hour or two. It's been suggested that it could be the expansion valve. Does this sound like a likely cause?

Bob

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BobH 90 R129