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I have a volkswagen golf ABU why does too much coolant overflow from behind the bolt head that holds on the outlet flange on the head?

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I'm not sure I understand what you are asking here, but it sounds like you are leaking coolant somewhere you shouldn't be? In a properly sealed engine, there should be only one place where coolant has the possibility of leaking and that's the overflow. Can you please clarify what you're asking us or the problem at hand? What you have given isn't much to go on. –  Paulster2 Apr 30 '14 at 13:07
Too much overflow is usually a sign that you have air where you shouldn't. Either because there's a trapped air pocket in the system which expands when the engine heats up, OR because you have a blown gasket that leaks exhaust gas into the coolant system. –  Juann Strauss Apr 30 '14 at 13:41

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