Blend and center doors should work independently, one for temp control and the other to block or unblock flow from middle vent.
At least this was my first-hand observation testing them during my surgery there to tape-shut holes on those doors found completely naked without original foam.
And Boxster heater is so powerful and very quick to warm-up, even with low temp thermostat.
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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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