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That is happening because you have a leak somewhere in the system and it is not allowing it to build pressure. when there is no leaks it would not boil over because the pressure in the system would in a way compress the water from becoming a vapor. and that pressure can be getting lost threw a crack in the radiator, a hole in a hose, a loose hose, a bad radiator cap pressure seal, or a crack in the block.

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Q: Why does water bubble up through your expansion tank coming off your radiator and the engine gets very hot?
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