For info.............taken from a previous thread:
I have had enormous problems with my AC............2006 model GTI. I discovered later that there were serious issues with a certain make of compressor fitted around 2006 and that a Technical Service Bulletin was issued in 2007 to address this problem.
My AC packed up when the car was less than 2 years old and had only about 20K Km on the clock. What had happened was that the compressor had destroyed itself and deposited all manner of sh1te throughout the AC circuit! Now a simple compressor replacement and re-gas is a complete waste of time as the sh1te in the circuit will cause a very rapid destruction of the new compressor. The solution, as outlined in the service bulletin (from page 4), is to replace the condenser (that's the radiater next to the engine cooling radiater in front of the car); replace the compressor with a different make and replace the expansion valve, together with a complete and thorough flushing of the refrigerant circuit.
My French stealers, in their wisdom, simply replaced the compressor...................3 TIMES!!!!! Imagine the cost! Fortunately all under guarantee. Anyway, before wrecking a fourth compressor they got wise and replaced the entire system! This lasted for 6 months over the Winter but when things started to warm up I realised that the cooling was not what is should be so I thought...................Merde! Here we go again! However the stealers now have a new service manager who is very much on the ball and after verifying that the gas charge was OK they quickly diagnosed the problem as a dodgy interior temperature sensor which was replaced and we now have cooling again!
I have a copy of the Technical Service Bulletin if anybody wants it (in .pdf form) but I do not know how to upload to the