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Message: <blockquote data-quote="GDTrumbo" data-source="post: 596697" data-attributes="member: 10665">Just off the top of my head it sounds like a head gasket. When this occurs, different things can happen as far as symptoms.Appears the breached gasket is allowing the compression from a cylinder to leak into the water jacket thereby over pressurizing the cooling system. After that the weakest seal in the system will let go and release coolant. The hissing sound can be very dangerous... avoid source!You shouldn't really have a leak involving the timing cover gasket as there is only a chain, gears and low pressure oil behind it.Let it cool down a while, remove the rad cap, slowly release pressure and restart. Don't hose it down with cold water. If the coolant starts to boil rather quickly, a gasket is gone.Be carefull, you don't want the burns from it.GT</blockquote>