It seems to be the season for Audi air con problems! Well my unit gave up the ghost sometime ago. I took it to my local auto sparks and they found that my compressor would not engage. On further inspection he said that the compressor would power from an external power source ,i.e not the car dc supply? Does that mean the control assy is knaffed as a pose to the compressor? I was then given a quote of £480 for a new compressor, dryer and re-gas. To be honest that's an ok deal compared to ******* prices.