What's the Make/Model and Engine in this TravelCraft? We had a 1971 Dodge Van, 318 engine. I got some larger exhaust manifolds from another vehicle and what I found was the larger ones got the doghouse hotter. I swapped a 360 into it and same thing. But both of these were "small block" engines. RV's, starting mid-1970's, got the "big block" 440 engine. That big engine, with big manifolds, is going to be right against the inside of the doghouse. It'll help to have the insulation inside the doghouse in good condition, the gasket in good condition, and the doghouse installed straight and tight. It'll still be hot.
We've had two Class C's on Ford and neither was as hot as the Dodge.
Make sure the Radiator is CLEAN inside and out, Fan, Fan Clutch and Thermostat are good, and all the Shrouding is in place. The more heat you can channel out, the less you'll have to deal with. Same for the exhaust. You don't have to replace all these parts. Just check to make sure they're working.
