I have an issue with my A3 2.0 TDI 2004. If I am at idle for more than 30 seconds (sitting at lights for example) the engine vibrates a bit then the compressor trips out (the econ button illuminates) and the only way to get the compressor back on is to turn the car off. Driving about its fine and will go forever, but when I stop especially if its hot it will trip out.
I recently have had the clutch on the alternator replaced (it was doing this before and I thought that would have sorted it). The compressor was replaced under warranty (3 years ago) but from memory when that went the air con was never on. I have never recharged it and its 6 years old.
I read the informative Air Con FAQs but it didn't give me any answers on this problem, is it common?