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Yeah, I'll second the pressure test.. or third it in this case... LOL! At least that way you can put the cooling system under pressure without getting it so hot you can't work on it. And you don't have to be driving to get it properly pressurized.
It's probably something simple like a small pin hole in a hose or as stated a broken hose clamp or leaking radiator cap.
Look along the sides of the engine block for signs of liquid running down too. It could well be a leaking head gasket. Does your engine oil look like chocolate milk on the dipstick? If so, then you probably do have a blown head gasket. It may also be a freeze plug that's leaking....or even a coolant drain plug. All worth checking.
It's probably something simple like a small pin hole in a hose or as stated a broken hose clamp or leaking radiator cap.
Look along the sides of the engine block for signs of liquid running down too. It could well be a leaking head gasket. Does your engine oil look like chocolate milk on the dipstick? If so, then you probably do have a blown head gasket. It may also be a freeze plug that's leaking....or even a coolant drain plug. All worth checking.
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