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Anonymous provided their own fix. Good job but you may need to fix it again when Summer comes.
I fixed this problem. I removed the Vent Mode Actuator from under the dash on the drivers side, then I moved the vent shaft by hand. I noticed some of the plastic parts attached to the shaft didn't move when I rotated it, so I just rattled the parts around with my finger. (I think one of the plastic gears inside had jammed and the rattling unjammed it) In any case, the internal louvers are moving with the shaft now, and heat is coming out of the front vents as it should.
Look in the front dashboard. You should have vent controls (2-3 buttons).. Press a couple while your air is running... If it doesn't blow air, your vent hose might have been removed or are clogged
Usually a sign of a faulty blend door under the dash. The blend doors direct air thru the heater core and the vent outlets. One blend door is directly behind the radio.
The air suspension uses the same vent solenoid to vent front so that will be ok. The problem will either be the rear height sensor which mounts on/near left side of rear axle. Or the air suspension module itself.
I would suspect it is the rear height sensor,the link may have come unhooked or it may be sticking or just bad.
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