Check for a vacumn leak follow the lines that come out of firewall this can be the cause if you find a leak
SOURCE: My AC and heat will only blow out of my defrost
Check the actuator motor under the dash,you may not be able to reach it,there is one under the dash on the bottom of the blower box,this is not the one,this one is the temp door actuator,you need to find the directional door actuator,follow the clicking noise,this is the one that needs attention,the door is stuck,or the actuator motor is bad.If this was at all helpful,please rate.
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
SOURCE: 2000 gmc sierra 1500 5.3 v8. a/c heater control problem
your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps
Testimonial: "Very good information. THANKS!"
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.
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