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The are two controls on the heater. One is the blend door and that controls hot and cool, the other is the mode selector door and that changes the place air comes from. You should be able to see those and the area that controls the air in the plenum. The plenum is behind the glove box. Open the glove box all the way and see if the controls are visible. Activate the mode control to see if the lever moves on the plenum, the problem could be anything from a broken lever, bad control, loose control, or something that fell down the defrost vents.
On a 1996 model you probably have vac actuators that control air flow. Look under the dash and you may be able to see the actuator that controls flow to the defrost and vents. There would be another one for temp control.
I just fixed mine. The lever that opens and closes a door that directs the air flow to the defroster was broken. To be more specific, the plastic lever the actuator attaches to was broken. The actuator and the vacuum system were operating properly. It is simple to see but hard to get to. Remove the glove box and look up and to the left for a silver vacuum controlled actuator. I was able to fabricate another lever and attach it to what was left of the OEM lever.
Hi! It may not be a vaccum problem. I think that the hoses that goes thru the main vent is the problem. They may have fall thats why theres no air coming out of the main vents only on the defrosters. Check the hoses and connect them to the main vents and it will resolve this. HOpe this helps and have a good one!