92 taurus: blower works, no airflow

I have a 1992 Taurus in which we get no airflow from any part of the AC/heater system at any blower setting. The blower works fine at all settings, and the input side of the blower is clear. All the vacuum
actuators I can see seem to do what they should, including the recirculate door, the floor/dash outlet, and the defrost door (both "mix" and full defrost). With the blower out I can see the input side of the evaporator, and nothing is blocking it. Any ideas? Can the blend door park in a position with no airflow? I haven't even found the blend door actuator to play with it. Can you even see it or feel it or in any other way diagnose it without removing the entire dash?
Thanks in advance, Frank Kerfoot
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