When I pour water/antifreeze into my radiator it comes out of the tailpipe, what could cause that? - Quora

Answer (1 of 6): The water is an engine coolant as you are probably well aware. For it to come out the exhaust when refilling your radiator it must get into the exhaust pipe, this can be achieved by having a great big crack in the engine block that allows the water to drain into the exhaust side

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When I pour water/antifreeze into my radiator it comes out of the tailpipe, what could cause that? - Quora