Climate Control Troubles

[Dag Bøsterud]

I have a late 1990 Audi 100 TQ Sport, with climate control (ECC). This ECC has been bugging me for some time, probably since I started using the car, but at that time temperatures were so low here in Norway I took no notice of it.

The problem seems to be that the system is very fond of blowing hot air into to passenger compartement. It even blows hot air through the centre vents. I thought that hot air was supposed to exit through the nozzles on the front window and the footwells. That's at least how this system worked on my very early 1986 Audi 100 Quattro.
Anyhow, back to hot air problem.

If I drive along and set the temperature to 24 C and it's 13-14 C outside, it starts to heat the passenger compartment up - through the center vents - like there is no tomorrow. It heats and heats and heats and although I'm kind of frozen I start to sweat! I have to turn it down to 20-21 C for it to cool. Anything above that, it only heats.

If I set the ECC to 25 C it seems to direct the air up to the front window and footwells. The Bi-Level function works. I run the ECC in ECON-mode for the time being, since there is no need for the AC-compressor to run yet due to the temperature, but I have tried to run it in AUTO-mode; no change.

I disassembled the little motor with potentiometer (V68) that controls the temperature flap, and although it looked clean and nice, I cleaned it out and put new grease in it. No change.
The link contains the readouts I took today; no fault codes stored on channel 1.
http://www.little-e.com/ac/ac.jpg

I hope someone here can help me resolve this :)

/Dag
1990 Audi 100 TQ Sport Exklusiv