heater box flap
I understand two LH-side climate control levers (1) control defroster/cabin airflow and (2) air flow to the heater matrix with one position restricting it to blower only and the other position allowing wing vent air to come in. If so, is the bulkhead flap supposed to be closed or opened by a different control? (see pix bulkhead flap)
When I move the LH-side lever that is labeled "hot/cold" I can hear a fwp! fwp! but the bulkhead flap does not move. If a cable mechanism inside the heater box is detached, how do I access it? It seems the heater box is a riveted and closed unit. Or maybe not . . . do I have to take apart the heater box to access the inside cable connection?