This is the second time this has happened to my 2005 300c. It appears that the evaporator is freezing up. It first happened in the first week of May of 2007 while coming back from a family trip to Destin, fl. I just got back from another family trip (5-10-08) and the air quit working again. I took it to the dealer in May of 2007 and thought they fixed the problem but evidently they didn't. Has anyone else had a problem with their a/c on long trips(8 hour trips)? And just for information I still enjoy driving the 300c!