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Teeny update.
Jack got in his high pressure radiator cap. He did a test to the car's cooling system, it held at 24 psi, no problem. He then tested the new cap, it held at 23 psi for 1 hour, no loss of pressure. He tested the old cap that was on the car, it started to bleed pressure at 12-13 psi, and went downhill from there. All pressure gone within 5 minutes.
So it appears the overheating culprit may have been nothing more than a bad radiator cap. Here's hoping....
Bob
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