This is a known fairly common problem with multiple fixes. It is the foam, or loss of it. The heater flap doors are full of holes covered with the foam. It dries out and blows off rendering the flaps unable to seal and divert.
do a search many vids of repairs.
https://rennlist.com/forums/996-forum/1041050-996-heater-flap-repair.html
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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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