Quote:
Originally Posted by sleeeper
I appreciate the help but I don't think I'll be starting there for practical reasons. The current radiator worked fine until recently and is a high quality replacement. Again, this is a new problem not coincident with the installation of the radiator. I may explore a way to disable the lower gasket on the radiator cap to return it's function to that of the stock radiator. but none of that would explain the overpressure problem directly.
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It sounds like you increased the coolant to water strength to a higher concentration than before. Coolant/antifreese will increase pressure and temperature at coolant concentrations greater than 70%. Unless your in a really cold climate, a mixture at 50/50 is usually best!