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It's a convertible. Convertibles are notorious for for small leaks, high humidity in the cockpit, etc.
Porsche defaults the climate control to ON so the demister (along with AC for a source of 'dry' air) can prevent windscreen fogging and also to dry out the carpet, ductwork, etc. of any moisture to inhibit mold and mildew growth (again a common thing in convertibles).
LIOLWT - Live it... Or Live With It !
Cheers!
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