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There is a flapper or trap door in the dash board that diverts air flow to various vents, defrost, floor, face, etc. If that stops working it will get stuck in the default position which is usually the defrost vents.
If you have a vacuum operated system you can check the vacuum hose for the system in the engine compartment for integrity. If that is ok then you have to get to the vacuum switch in the dashboard and probably replace it due to leaking vacuum - labor intensive and not cheap.
Any time the dashboard has to be removed you are in trouble money wise.
The flow or travel of air through the dashboard vents, on top defroster vents, or floor vents, that is all regulated, in most vehicles of these days, by vacuum.
You have a set of vacuum hoses that operate the direction and flow of air.
You probably had a hose or two, (probably more correct to use the word tubing)...
You had some tubing get disconnected, or it became brittle and broke.
Now you just have to locate that vacuum leak.
Defrost has been stronger on all types. Just the way plenums are made. Clear that wind shield first. As long as you have plenty of heat to keep the cabin area warm to hot, it's OK. I wouldn't woory about it.