Join Date: Jan 2009
Location: Taif. Saudi Arabia
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Sounds like the head gasket, leak between a cylinder and the water passage, overpressurises the system and blows at the weak link wherever that may be...
remove the spark plugs when the engine is hot and the cooling system is pressurised. (I bet the hoses feel hard!) you may find water leaks into one/more of the cylinders after a while.
Head gaskets aren't too bad a DIY fix but get the head checked to see if it's in need of a skim.