Heater Box Design - Lame?

YY1 said

What does the temp slider do on the OP's car?

Been a while since I had an A, but all my B's have that slider control a valve.

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Off/Temp low: flap into heater core and flap out of heater core closed.
Heat/Temp High: flap into heater core open and flap out of heater core wide open.
Def/Temp High: flap into heater core open and flap out of heater core wide open. Another flap opens defroster hoses and closes heat exit.