cre you said when you reduce the pressure in the cooling system the boiling point rises, right? Well you have it backwords. When you pressurize a liquid the boiling point rises.
Your cooling system should hold 13psi all day long. That's the factory spec. Mine held 16psi when I tested mine with a blown head gasket. You don't want to pressurize the cooling system over 19psi with the tester, that's in the red zone on the gauge on my tester.
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