Low refrigerant will definitely cause this - at least on a crappy Ford Tempo I once owned and a slightly less crappy Volvo 240 that came afterward.
I haven't charged the AC on a Boxster, but I assume it's DIYable, and it's a cheap first troubleshooting step since you can buy recharge kits at Target and WalMart...
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1999 Carrera 4 • Aero kit • 4" UD Pulley
My Corvette doesn't leak oil... it sweats horsepower.
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