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If you're seeing foam in the coolant and it's being pushed out of the coolant system, you PROBABLY have a blown head gasket or cracked head.

If the engine has overheated even once recently, the head probably warped causing the gasket to blow, or the head could have cracked.

Either way, it's fairly serious and should be addressed promptly.

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12y ago
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Q: Why does antifreeze foam out of cap on reserve bottle on a 1996 saturn?
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