72 A/C K20 no defrost help request

[Tumbleweed1C4]

My new K20 heater blows hot air like mad, but only out of the center bar in the dash above the radio. Virtually none out of any other outlet no matter what I do with the levers on the heater control panel. I have seen a couple other threads referencing possible vacuum line problem or a broken flapper/diverter door, but looking for help and clarification on this. The cable from the defrost lever is disconnected on the heater box from the diverter lever that it attaches to as if the PO were troubleshooting the problem. That lever works by hand, and feels and sounds as if the flapper door is moving properly in there. Is this the diverter that I am supposed to be looking at?



or something else?


I looked under the hood for a 3 position vacuum port where something might be disconnected but not seeing it or don't know where to look.



Any help or advice appreciated.

and, just because