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This is standard on most all vehicles. When the antifreeze warms up it expands. Thus the reason for the overflow. Cars have had them forever, if it spills out onto the ground you have either overfilled it or you may have major engine problems, such as a blown head gasket or various other possilbe problesm

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Q: Why would Anti-freeze be going over into overflow but not leaking on ground?
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Why does your car sound like it is drinking antifreeze and disappear when you put it in but it is not leaking on the ground?

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