Brrrrrrr N-n-n-n-no h-h-h-h-h-heat

[George Selby]

While I was waiting for the sheets of ice to melt off my other car, I had 
opportunity to look at the 89 Audi 80 heater situation again.  The 
reservoir was empty (?)  but I filled it up again.  I let the car warm up 
(fan going off and on) but still there is very little heat.  I set the 
selector to defrost, and the windshield is slowly deicing, but if you put 
your hand over the defrost vent the air feels cool.

I went under the hood, and felt all the hoses.  All the hoses are 
pressurized and hot to the touch - except one of the heater lines is cool 
to the touch (the other is the same temp as the rest.)  Is there some type 
of heater valve in under the dash?

George Selby