Don't they make a sensor you can detect the exhaust gas in the radiator. It acts like a head gasket but water is not getting into the oil or cylinders, pulled plugs and all look normal. I have heard to do a compression test and the one that is blown will read low... but still water in the cylinder would be quite obvious. When I was shining a light in the overflow and watching the water come in from the bottom it was blowing air bubbles for a couple of minutes still that is weird to me also....
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