I had this problem too. On drivers side under the hood, literally right under where the hood shuts across from master cylinder. There is a small nipple that comes out of the fender way up under the fold in the fender. There is a hose that's supposed to hook to it, look for it.
SOURCE: air wont blow out of the front vents only the defrost vents
Not sure about your exact model but a lot of these are vacuum actuated. If one of the vac lines is broken, leaking or disconnected this will happen. Maybe take look under the dash to see if something is obvious while you try to switch it - look and listen, good luck.
SOURCE: Dash vents will not blow air. Defroster and floor vents blow fine.
Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.
SOURCE: vent selector stuck on defrost (knob turns - no
There's a good possibilty that you have a vacuum line off. When the heater controls lose vacuum, the heater will go into the defrost mode. There should be a small line, about 1/8 inch in diameter, that goes from the engine to the firewall. It's most likely on the passenger side.
SOURCE: A/C not blowing thru vents just defroster and floor
It is a vent door actuator motor on top of the blower box,the dash has to be removed and set in the seats to replace the actuator motor.Cost for the part is about 50.00 dollars
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