Air conditioner doesnt blow cold. Heater doesnt blow hot. Coolant level is good. No leaks.

 

Im not sure if the models later than the A4B6 do the same thing.
But the A4B5 climate control flaps have a foam covering which perishes and then lets air blow thru 5he holes in the heater flaps.
My A4 B6 has similar problems but i have not checked the flaps yet.

Check if theres sheet foam bits comming out if or stuck behind the vents.
Or use a endoscope ( camera on a long cord ) to look down the vents into the air box and see what the flaps look like.

 

If there are foam bits coming out, how do you fix? Replace the flaps? I feel like I've seen this on my B8.

 

The flaps need to be taken out & new foam glued over them if thats the problem.
I did my A4B5 and posted up a bit of a writeup, it took a day to take apart, another to fix & another to put it all back together..
But first, check to see if it is loose foam comming out the vents, or stuck behind the vents, or use a endoscope to view right down into the heater box via the vents.( $10 on ebay ) USB endoscope.

I have a feeling that i will need to do my A4 B6 as well. But im double checking after i fix the thermostat problem first.

The big thing is to make a thick cardboard sheet up & screw the bolts and screws into it and label them as you remove them. And dont firce anything, if it wont come out easy, theres a bolt/screw/clip holding it in still.

 

Thank you very much! I appreciate the response! I'm going to try to figure out my timing issue first, then tackle some of the other nuances. lol.

 

I think MarteA4's observation about the pieces of foam blowing through the vents is indicating the problem that I have been struggling with for a long time. It has to be something to do with the blending of the air somewhere under the dash. I shall check that out. Thanks.