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#10: 10-30-2012, 09:29 PM
Title: Contributor
Location: Galena, IL
Car: 1999 Legacy "L" 5MT 271k
Posts: 597
iTrader: (1)
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Probably the coolant overflow tank. The caps on those are pretty small...

If the compression is leaking past the HG it will overcome the radiator cap valve and vent it constantly it into your overflow tank.