Fan works fine, but no matter where I put the selector (ac/dash, vent/dash, heat) the air only comes out through the windshield defroster vents and the floor vents. Also, AC does not turn on. Tried swapping out the switch with a replacement one but didn't solve the problem - maybe a vacuum line?
Could be a lack of vacuum . With a vacuum gauge check source vacuum at the heater A/C controller . gray # 6
The problem is probably a faulty diverter door actuator or vacuum problem at the HVAC plenum under the dash. This is a common problem - see YouTube for help diagnosing this:
https://www.youtube.com/watch?v=Nlt9A1sp-4U
SOURCE: HVAC vent selector does not function. Air flow is
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)
SOURCE: climate control system only blow air out defrost vent
there is a good chance that you blend air door is stuck closed over your heater core and therefore not allowing the heat to flow, also your door that opens and close your direction of flow from the floor ,das,vent and defrost.your going to have to remove the lower cowling of the dash on the passenger side analso some of the center dash to actually check to see if the cable,servo motors. are acuating the doors.the issue could be just a stuck door or a misaligned cable or that it came off. that falls under the mechanical side of probabilities. electrical would most likely be a faulty selector switch or a servo motor
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: 2003 envoy ac blows cold from defrost and floor but will not dash
u have to take your dashboard at the glove compartment to cheack the vacuumpod ot your damper door
SOURCE: blower vent selector switch not working
this is what is called a factory default. for safety purposes if there is a problem with the wiring in the climate control system it defaule to the defrost position so you can see out the window. this can be a pretty tough job, the whole dash may have to come off. unless you well versed in automotive diagnostics and troubleshooting, and have the right equipment, I would take it to a local automotive technician.
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