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fill the radiator full-up to the neck-crank the engine and watch for bubbles, sometimes you can see the combustion gases from a leaky headgasket. also pull the plugs and look for a "clean" electrode on a plug-water will clean the carbon off, easy checks. also another thing you can try is filling the radiator up-only after you have warmed up the engine to temp with no pressure cap and then put the cap on