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Message: <blockquote data-quote="clintrobbins" data-source="post: 26312" data-attributes="member: 2733"><p>Update with the solution: After checking everything else, my last step was to flush the radiator. Although the coolant tank was full, I added the flushing liquid to the radiator and found that it took a few quarts to top off the radiator. While flushing, I found that it didn't overheat while working it for about an hour. So, I started watching the coolant and found that when the coolant warmed up, it expanded into the coolant tank as it should. BUT, as it cooled, it didn't return to the radiator - so the coolant tank eventually filled up and started spitting coolant out of the coolant cap vent. I then discovered that the radiator cap gasket between the radiator and atmosphere was shifted to one side and wasn't sealing. Therefore, as the coolant cooled and should have been returning to the radiator, it was sucking air instead! I ordered a new radiator cap but, in the meantime, I shifted the deteriorated gasket into the correct position and that solved the overheating problem.</p></blockquote><p></p>