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It sounds like your air flow diverter is stuck on defrost. Basically it is a little door that diverts the air fom vent to defrost to feet. It could be either the heater control valve, or te temperature selecter cable is broke.

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Q: SINCE I HAD MY 1987 Nissan 300zx SMOGGED I HAVE NO VENTILATION FROM THE VENTS WHETHER I TURN ON ECONOMY-AC THE AIRS BLOWS OUT OF THE DEFROST VENT ON TOP OF DASH?
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There are a couple of possibilities. The vent diverters are either physically stuck in the duct work or the diverter motion has been stopped by losing a power source. The diverter is the vane within the duct that changes the location/direction of the fan controlled air movement in the vehicle cockpit... whether it's providing heat or air conditioning. The power loss could be the electrical wiring, fusing, motor or the solenoid providing the positioning of the vane. Another possibility is the "defrost" selection or button is always on or enabled. I hope this will help you in determining the problem. WBT