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The most likely, and expensive, explanation is a cracked cylinder head or leaking head gasket. If the exhaust blows white smoke when hot and smells sweet like sugar, you have a major engine repair. The liquid that flows out when you start the car is coolant that has condensed back into liquid after the exhaust system cools.

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Q: Why does my 1999 grand prix blow antifreeze out as soon as you start engine?
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