Quote:
Originally Posted by Mike Murrell
Neither of these will cause an "over pressurization", but just the opposite as pressure is lost when a cap is faulty or HG is leaking.
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I disagree. When our head gasket leaked, perspiring coolant hoses and failures were the result. Although part of that is deterioration from oil contamination, oil in the coolant and NOT vice versa is a good sign that combustion pressure has leaked into the coolant passages where the pressure will then be excessive. As these are fast pressure bursts, I would not expect the reservoir cap to protect in all cases.
Check for oil in the coolant.
Steve