We had a similar situation last year when we were out west. It turned out to be the cap on the coolant recovery tank was apparently cross threaded at the factory. It was never a problem at sea level but when we started going up to higher elevations the engine started to overheat. A service tech found the cross threaded cap. After the cap was properly threaded we didn't have any more overheat problems.
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Woody
Mass State Police (Ret)
Dudley,MA
2022 Winnebago Navion
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