Over Heating Problem

[SCJax]

I’m working on a friend’s 1983 Winnebago about 65,000 miles. It keeps over heating on the road and he has taken it to every mechanic in the phone book.

I removed the radiator and thermostat and flushed the engine block and got some trash, but nothing out of the normal. Sent the radiator to a radiator shop and had it reconditioned. I replaced the water pump because it was down far enough to be easily replaced. I replaced the thermostat and temperature sensor. Put everything back together and the engine still runs hot on the highway.

I checked the engine timing because I know some engines will run hot if they are late on the timing and the timing is right on.

Does anyone have any ideas?? Only thing I can come up with is possibly a partially stopped up catalytic converter/exhaust system, but the engine doesn’t appear to struggle going down the highway.

[Pippi]

Did you ever find what the problem was SCJax?

[Don Legg]

SCJax, how do you know that the engine is overheating, temperature gauge or warning light? It is not likely but maybe one of them is giving a false reading. Maybe a muffler shop could check the exhaust system and see if that is the problem.

[Author]

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