Hello, I'm really desperate and i have a serious problem with the air con on my a6 1.9 tdi 2002. After it stooped working I've been at four garages including the Audi dealer and they could not find the problem but they charged me around 80 quid each

. What they all done, they recharged the gas and they plugged in the computer or vag com and here's the problem because what they get is "no communication" or "error too many communicatios..." so result to this no one has a clue what's the problem and they call them-self air con specialists. Anyway fully recharged when i switch off the econ mode the compressor will not kick-in but i can hear a relay under the dashboard clicking and by the way all the fans are working fine. Now please there is anyone who can help me because i really don't know what to do when no specialist in UK can fix this and outside we have nearly 30 degrees. Thank you.