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#10: 10-30-2012, 09:29 PM
 
 Tr00b
Title: Contributor
Location: Galena, IL
Car: 1999 Legacy "L" 5MT, 1997 Jeep Wrangler
Posts: 498
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.