1996 Volvo 850GLT Airflow knob not working
 

Both climate control knobs work for adjusting from cold to hot, but the knob controlling where the air flows, to feet or the face, as well as controlling the front defroster, doesn't. Can i tear off the panel and fix some connection behind it? Or is linked to a fuse separate from the main climate control temperature knobs near the drivers seat?
Anything would help, thanks!

The automatic Heat/AC controls are quite easy to remove, but of course totally impossible to repair unless they're simply unplugged. The mechanical controls are torture to remove but then of course it's really easy to see what's wrong.