Our 2005, 2388 has issues with the air conditioning system. It seems whenever it is a nice warm day and you want the air conditioning to work, it doesn't. The valve under the buddy seat turns to shut the heat off but we seem to continue getting heat. The windows will fog up. To fix the problem short term, we put a manual valve in the heating line to shut off the hot water. The air conditioning will work then. Has anybody else had this issue? Any Suggestions?