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the heater & defroster baffles are controlled by electic motors that open and close the baffle (doors) to let the air to the heater and defroster vents. the motor must be bad
Maybe your dashboard vents are clogged, obstructed or stuck in close position somehow.
If not, check the air hoses that carry the cooled air to the main vents are not clogged, bent, ripped or simply detached. If its practical for you, check if they are correctly placed, clean and general conditions are ok if you can.
If above are not the issue, go to check outlets of the A/C unit, its filters for the possible reason.
THe blend door seems to be stuck. When you change settings from defrost to floor air or, vent, the blend door opens and closes directing the air to the place you want it to go to. I have had some success spraying a lubricating oil such as WD40 under the dash on the blend door. You need to get under the dash with a flashlight to locate it. It looks like a flap. Spray it with a couple of shots of the WD40. Go easy on the spraying as you may be inhaling the fumes. Keep the doors and windows open to minimize the fumes. Wait about 1/2 hour and try the A/C functions. (defrost, floor, vent air)
You have a vacuum leak. Look under the dash and check the placement of the vacuum hoses that activate the vent doors. One or more may have slipped or may be cracked.
is the cabin filter new? id check that. might be restricting air. if not then control unit might be faulty. it could also be those cable that change where the air should be.
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