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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?

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?

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.

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