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1989 corvette has what looks like steam coming from a/c vents

(1990 Chevrolet Corvette)
in Sun City, CA on April 24, 2013
Happens after car is warmed up. Steam has odd smell, probably from anti-freeze. But how does it get into a/c vents? And what causes it?
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Popular Answer
on August 23, 2013
most likely it's the heater core.
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on August 23, 2013
most likely it's the heater core.
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