AC problem not the normal BS

My AC works but it does not blow cold air. I put it on AC the compressor fires up the aux fan starts and the blower kicks up. I checked the R-134 pressure its around 84psi on the low side checked the vac line passing through the fire wall and the check valve, holding vacuum there. even were the R-134 lines pass through the fire wall they have condensation forming on them So I know everything on the outside is working. it kinda sounds like a vac leak when I turn it on on the inside of the jeep but I can seem to find a manifold to follow it. But the little flapper down by the passangers feet opens and closes when it should, what the heck.

Sounds like a problem with the blend door in the box under the dash.