Thank you for the insight Nate.

So it turns out, the switch wasn't the problem.

I removed everything you mentioned and looked behind the glovebox.

I'm able to more the fan switch cable up and down no problem... but nothing happens.

I got some advice that this is likely the fan door. The door that lets in hot air is not connected to this cable.

I'm worried this means that I need to take the dash out entirely?

Does anyone have a clue what I've done?