All this talk recently of heater boxes having correct foam insulation got me wondering.. Does 84 jetta non-ac have any?
So I went out to look, and it appears that it has good seals regarding the difference between the settings. Ie. If you have it on defrost none is coming out the vents or floor, and vice versa.
But it would seem that the little cover that covers the end of the heater core on the hose side is allowing quite a bit of cold air to be expelled in to the cabin.. How do we solve this?