Curious how that explains it not flowing the rest of the way through the radiator? Or the water pump?? Only thing I could think of, never heard of that problem before lol, but, maybe its not allowing a "vent" I guess you could say to "pull" the coolant through? Best way I can think of to describe the idea that popped into my head.... defiantly sounds like a long shot, never heard of any sort of gasket sealing "too well"...lol. Mind explaining the reasoning behind that??