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It is the foam that Porsche used to cover the HVAC mixing flaps. This deterioration is most common in hot humid climates. You will eventually lose air conditioning control as the foam breaks down. There are a few repair methods. Google 996 vent foam, heater foam etc...
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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