Air flow not switchable by control knob

I have a 99 Explorer and noticed one day when attempting to use the A/C that
the air flow was minimum at full thrust. I took it to a mechanic but he
wasn't able to locate the problem. He said he took some of the dashboard
apart but didn't detect cause. The last thing he mentioned was a pin had
disconnected from a flap that switches air direction. Anyone have any ideas?
.

Relevant Pages

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