[200q20v] RE: No air from the center vents, A/C Re-circulation Door Problem s?

[Paul Meyers]

You need to get yourself a mightyvac (hand vacuum pump), then test the
actual vacuum output from each solenoid. You have a leak. Due to the design
of the programmer, a leak produces exactly the effect you describe, no AC to
the outlets you want (defroster only). You can have a bad solenoid, leaky
hose, leaky vacuum actuator, etc. I have had ALL of these. The only road
ahead is to eliminate each of the possibilities in turn.

Paul Meyers
Gray 87 5KCSTQ 1.8bar eurolights fuchs 145 kM parked, loom is toast
Pearl 88 5KCSTQ 1.8bar eurolights fuchs bilsteins 122 kM 2pc-em k24 turbo 
Burgundy 87 5KTQW 191 kM under repair
Blue 86 5KCSTQ parts car


-----Original Message-----
From: Neil Vonhof [mailto:nhv at citylinq.com]
Sent: Sunday, August 06, 2000 4:08 PM
To: 200q20v at audifans.com
Cc: quattro at audifans.com; audi-nw at u.washington.edu
Subject: No air from the center vents, A/C Re-circulation Door Problems?


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