Just got the car back with new upper suspension arms both sides at front, the ride is a whole lot better now so they must have been quite bad.

Got the diag codes out of the AC control head and it says fault 8.5 which means "Temperature Regulator Flap, static block" so the next question is how do I get to the flap? It's a 1996 A4 1.8T, I have done a search and can't find anything for this models temp reg flap. Guess I'll just have to start pulling the dash apart, starting with the glove box and see where I get.
I think it might be the flap that is stuck as the diag code document says it should cycle to eliminate block and it did used to do this as I used to be able to hear the flap motor pulsing on and off but it no longer does this. Is there anyway I can reset the control unit or is this not necessary?

 

I fixed mine with a little help from ANDYCQ20V @ www.audifans.net

The purple motor controls the temperature flap - if you remove the glove box you find that you can see a purple plug, this controls the purple motor. I just wired it up to a spare car battery and operated the motor - the climatre control unit only usually supplies around 7.5 to 8 volts to the motor, by giving it 12 volts freed it off - it seems that they can become stuck from time to time (the brushed must in the motor must be quite soft and can leave dead spots on the commutator).

I powered the motor both ways a couple of time and reconnected the plug, switched on the climate, turned down the temp to LOW, hit the snowflake and enjoyed ice cold air.

Good luck with your fix

Stu

 

To access the purple plug just remove the glove box and the plug is attached to the metal frame that hold the centre console in place - you can't miss it. It's a 20 minute job.