Hey, here comes the Climatronic expert!

As I'm currently finishing the process of gathering all needed parts for a complete Climatronic installation in my B3 (95% done!), I've collected a good amount of relevant documentation.

Here's the URL for a reference: http://forums.vwvortex.com/zerothread?id=2279969 . Also, on that page you have lots of ETKA screenshots, and the complete wiring diagram for the B3 VR6 Climatronic.

A2B4guy: That's the B4 Climatronic, and it looks almost the same as Kent's B3 Climatronic, that looks like this:

And now, here comes the complete "VW Climatronic Selfstudy" factory manual, I had really hard time finding that stuff, it's in German but Babelfish translation is quite usable. That manual covers the 1.8l AAM and ABS engines. Enjoy, and sorry for large pics.

Edit: There's a section in that manual that covers the Climatronic "debugging" procedures, and you can pull any possible error codes. As you'll see, Climatronic has two sensors for air temperature, the one in the lower section of front bumper, and the one below the A/C filter, inside the evaporator housing. The problem you're having still seems like a bad "bumper" sensor, if you could try an another sensor there, it would be good as your next step.