Like what was said before, by misting the water in a bong, it evaporates and that is what causes the cooling. You cannot do that in a closed system (I don't even want to think of what kind of monstrosity a phase change system with water as the refrigerant would be). Due to the water pressure, you wouldn't be able to achieve misting at any rate unless you had a 4-5 inch spreader, and it would be recompacted to fit into your radiator. Go ahead and do it. It might look neat with some leds or something, but it won't do you any good whatsoever. Sorry.
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