Woops! You are absolutely correct on that one, I flat didn't see that about the cap. I was zero'd in on him running without the radiator cap. My apologies. Someone years ago gaver me some rather bad advice about running without a cap and I almost lost an engine. Anyway, I've had the same problem with my 71 cleveland and it turned out to be a pressure problem. The gauge indicated hot and all that it needed was a new cap to stop the boilover and a new sending unit to correct the nonexistant overheating problem. But please, never run without a good radiator cap. It may cause cylinder cavitation problems that will destroy your engine.
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Father to two Teenage boys and three Mustangs. 71 Mach 1, 85 LX trunk, and one '89 GT
Someday. . . It's gonna be Dad's turn to build one.
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