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Strick,
Grego37 has a good suggestion. I have one of those pressure testers and have found two Radiator caps that were rated at 16 pounds opening at around 12 pounds. But I also had an idea of what to look at as I run one of those cheap NAPA overflow tanks where the water goes into it when I stop and then as the motor cools it pulls the water back into the system. I could look at the tank and see water was coming into it quicker than it should. I had a chart somewhere around here that gave the difference in temperatures for water to boil for each pound of pressure the cap keeps in but of course I can't find it now that I want to look at it. Hope you find the problem soon.
Ron
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