Climate control issue: no heat from dash vents?

[stickrod]

I’m having an issue with my climate control and I’m not sure a FSR will remedy the issue.
I have heat through my foot well vents but I get no heat (at all) through the dashboard vents. In other words when I select the mid level and floor blowers heat is only coming out on the floor. The temp mixture wheel between the center vents is set to three red dots. I have full control of the blower speed which makes me think the issue is not resistor related.

Admittedly I have not checked any fuses yet. Any help in diagnosing my issue would be greatly appreciated.