It could just be over filled. My tank was over filled and I was getting condensation on the trunk lid where it seals over the tank. I wasn't losing any coolant out of the overflow hose, just condensation. Now that the coolant level is correct, there's no condensation.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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