Read this...
http://986forum.com/forums/performance-technical-chat/42802-interior-vent-debris.html
I had the same issue, lukewarm heat even at Hi, did this repair yesterday and it produces hot air now! Also fixed center/ side vent control flap too, it was blowing air all the time. Added more air flow to defrost and floor when closed.
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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