Heat warmer on passenger side

[burger]

So when I have the heat on in my car the passenger side gets hot like one would expect through the vents but the drivers side vents get warm at best. There is a very noticeable difference. What could the potential problems and fixes be?

[96 SSEi]

hi, does the volume of air from both sides seem equal or is pass side blowing more air?
also, when using a/c, do you feel a difference in temp and volume from both sides?

[burger]

Didn't really seem to notice a difference with ac, but dont drive it much in the summer and don't use ac a lot. The volume of air is equal on both sides.

[96 SSEi]

ok, if you close the vents on pass and the one for rear seat, is drivers side hot?