Having owned four T44s I have seen a lot of the issues.

Fogging is a sure sign that the outside air recirculation flap is not working right.

The improper direction of air to the vents may also be related to this same problem.

Fix:
Remove the glove box (two screws and quite easy to do).

On the fire wall up behind the glove box is the recirc door. With the engine off
it should default to a closed position against the fire wall. I bet yours is
hanging part way open.

If you pull it open there should be a spring attached to the center of the door.
It is probably gone or broken. Feel around inside the door (bi the condenser)
and you might find the spring. If you find it and it is not broken then the
attachment points are probably broken. One is a plastic ring in the center of
the door. The other is up inside the door in the center of two plastic struts.
If that is broken it is easy to bend a coat hanger in the shape of the letter
'M' that will be a mount for the spring.

After you have resolved the spring issue you will also fine a vacuum servo
inside the plastic pillars. This is used to open the door and override the
spring. You can almost bet that the vacuum line that goes to the servo has
fallen off. Dig around in there and re-attach it to the servo from the front.
This is a tight fit and very awkward to do. Try to borrow someone with small hands.

While the glove box is out you will also see a black box in the same area. That
is the climate control actuator that controls all the vacuum to the flaps and
operates the heater control flap by the blower by operating a cable with a
stepper motor. That might need some TLC as well but the recirc door fix may be
all you need.

Have fun.

TonyJ
Current: 98.5 A4 1.8 TQM APR S1
Former: four T44s '84 - '91

Paul R. wrote:
> Hello everyone!
> I recently acquired this model Audi and it's obviously old with
> many miles and, unquestionably, some issues.
> One of my concerns is regarding the air/ventilation in the cabin.
> The settings on the Climate control don't seem to be working
> properly. For instance when I switch the setting to Bi-Level no heat
> comes out of the vents in the center and on the sides. It sounds as if
> some flaps are being moved inside the dashboard to direct the air to
> the proper vents, yet nothing comes out of the front vents.
> Would any one be able to explain this?
> I'd attempt to repair this if only I'd knew where to start or had a
> beginning of what would possibly be causing this.
> The defrost setting works somewhat on the windshield, but the rest
> of the car fogs up terribly.
> I'm pretty sure the A/C does not work, if that is an indication of
> a symptom.
> Any help, as expected, would greatly be appreciated. To contact me
> directly regarding help on this use
> but remove 9spamulsuge9 from the address.
>
> Thanks to all for taking the time to read my message and, in
> advance, thank you (if replying).
> )
>
> Regards
> Paul
>
> P.S. This is my first Audi... I've always been a Volvo guy, but my
> 960 needs a little TLC and this little 5000 Quattro is really growing
> on me. )