'89 Audi 100 Heater questions

[SJ]

The blower motor is working?

What happens when you put the A/C control on "Auto" and set the temperature
to 80? Do you get hot air flowing?

"Heat Regulator"?  Do you mean the hot water valve in the back of the
engine?

This valve only shuts off the hot water when in "Auto", so forget my
previous statement.
But, you can disable this valve . . .valve is normally open . .  .  .remove
the vacuum hose and plug the hose with a nail. Then see if you get heat when
in "Auto" and at 80.

Also, check to make sure the recirculating air flap spring is intact and
attached. This may have nothing to do with your heating problem . . .then
again, it may.
Passenger footwell . .on your back . .with flashlight . . .look up. You will
see a plastic grill . .on the other side you will see a door flap. If its
open already, you will readily see the spring. If its closed, the spring is
ok . . .. this door wont close if spring or attachment points are broken.
But, you can play with the Climate Control buttons till you see this flap
operating normally.
This spring and the upper attachment point are common failures in our cars.

Let us know what you find.

The next step will be to check the operation of the A/C Programmer heater
flap cable . . . not hard to do . . .next time though.

SJ
85 Dodge PU, D-250, 318, auto
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q

==============
All,

Now that I have great information on the transmission, let's tackle the
heater.  No warm air comes out regardless of what we do in the passenger
compartment.  I did look under the hood and the heater regulator seems to be
functioning.  I am unfamiliar with this aspect of the car and only possess a
Haynes manual, which is one step removed from useless.  The temperature
readings seem to be correct as displayed on the dash and the air conditioner
works very well (we live in New Orleans, the heater is a nice to have, the
A/C is critical).

As always, thanks for the help!

Case