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i agree with jim for the most part. if you weren't overheating before the leak, then your problem is almost certainly air in the system. not sure how to purge it on a boxster. before replacing the t'stat i'd fill/purge the system, and see where the leak is coming from. while it might be leaking from over pressurization, if you weren't having an overheating prob prior to the leak, it's more likely just a heat-responsive leak in the tank/hose/etc.
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