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When you drive the overflow is pressurized when the engine heats up. As it cools down, the engine will "drink" the anti-freeze out of the overflow reservoir. It is most likely making a sound like when you turn a milk jug upside down and let it drain? Chug, chug,...etc. A vacuum occurs in the overflow reservoir when the anti-freeze is taken back into the system and you are hearing the equalizing of pressures...like a milk jug.

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Q: Why does your radiator sound like its drinking anit-freeze when you open the overflow tank?
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