My Performer is running great and not overheating. If I run it with the covers on, it builds up so much heat that the 240 degree sensor gets destroyed and the components get very hot and machine bogs down. If I run without covers the machine runs great but the van and everything around the machine gets extremely hot. Anything I have in the cab gets affected by the heat. The only thing I can think that would cause this is an exhaust leak but I don't hear anything obvious to me. I have taken it to mechanics for years replacing parts and seals due to heat issues but never had any identify the root of the problem.