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Old 05-26-2015, 03:19 PM   #12
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Join Date: Dec 2008
Location: Queensland, Australia
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If you have excess pressure in the cooling system then the pressure must be coming from somewhere.
1)It can't be the pump as I doubt it could compress up to ~ 20psi even with near boiling point water.
2) It could be a blocked engine / radiator vent line (#11 & 12 in diagram) but ??

I'd hate to think that you have a cylinder head crack opening up when hot and combustion gasses are "pumping up" the cooling system....
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