Read this, I fixed the same problem, now my heater works great and hot!
http://986forum.com/forums/performance-technical-chat/42802-interior-vent-debris.html
By the way it's very common problem and relevant threads are all over here... your search skill needs some improvement😁
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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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