I've noticed that when I have any particular vent selected on my car, that some blows from all other vents as well, but not as much. Just wondering if this is normal on a tl as some other cars I've been in blow no air from vents that aren't selected.

 

when the vents are 'closed' it's really just a couple of plastic flaps that turn with the wheel. if you look closely with a light you can see them. i'm sure a bit of air would get through, but if it's a lot i would check to see if they are actually closing or not

 

es normal