I was breaking in a new belt cruising in the river bottom about 30-40mph and its started to overheat and went to limp mode before I noticed anything and did it twice well it got hot the second time. Had coolant in it and I checked all the usual stuff fan, radiator fins not plugged. One thing was it was extremely humid and warm which is unusual for us. I went a different route back and it ran normal around 200. Any ideas? Could it have been a fluke with the conditions? I have traveled the same route at 50-60 in 100 degree heat and it didn’t overheat.

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