2008 Manual climate
Figure this may be a shot in the dark for a fix but it's worth a shot I guess.
With the heat on just the floor, some of the air trickels out of the upper vents. I have messed with it a bit and when I put it on half floor half windshield it doesn't trickle. It really not a huge deal just a bit of a pain when I'm plowing. This is prob a pita fix and prob not even worth it but wanted to ask.

Thanks in advance.