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. The coolant temp is normal operating temp. For some reason it pits off an excessive amount of heat inside the van.