[200q20v] No air from the center vents, A/C Re-circulation Door Problems?

[Neil Vonhof]

Following SJM’s instructions from the web site, I pulled the plenum, and
pulled the passenger side lower dash trim piece and inspected
everything: the return spring, servo mount, vacuum hose connection to
the servo, pivot arm; checked for sticky rubber door seals and
everything mentioned by SJM and it all looks fine.
The symptom is zero air coming out of the center vents, left, middle or
right. Plenty comes out of the far left and right vents on the top of
the dash (near edge of dash closest to the driver) and the defroster
vents and floor vents, but none out of the center vents on any of the
settings (AUTO, Bi-level, Econ, etc.). Also, A/C works just fine.
I don't understand the relationship between the A/C Re-circulation Doors
and the ability for air to blow out of the center vents. With the engine
running, Climate Control set on AUTO, blower on high, with the passenger
window opened, standing outside of the car on passenger side, reaching
under the hood with my right hand I pushed the upper door closed (by the
way, the “default” position now is upper door opened, lower door closed,
all the time) thereby opening the lower door, while reaching through the
passenger window and holding my left hand over the passenger side,
center vent and there was no change, no air blowing out of that vent.
So, should I be checking fuses? Is there more than one blower? Any
ideas?  TIA
Neil Vonhof
‘91 200q20v 128,000 mi