Interesting. Then you know which way is heat. I have no explanation for why you don't feel anything coming from the cowl vents. I don't think it blasts out of there but turn the heat on and see if you at least feel hot air coming through the vents.
I can feel hot air coming out but it remains unchanged regardless of where the flap lever is. And to that end it actually does (slowly) defrost the windows (again, regardless of where that lever is), but the air volume does not change (and like I say, it barely moves a piece of paper). That's why I'd like to know for sure what direction the lever is supposed to move. Then at least I can try and manipulate that flap a little more in the correct direction, I'm guessing it's caught on something and not travelling enough.
That floor vent, works great (again, doesn't change at all as the lever is moved) - I may try physically blocking that vent off and see if I can foce that air up onto the windows. I don't really want to pull that heater box out again to see what's going on with the flapper but obviously at some point, that'll have to happen.