Read this, I fixed the same problem, now my heater works great and hot!
Interior vent debris
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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