If you are saying that the aircon stops working and you have to fiddle with the flan switch, then get the fan switch and fan unit checked, as the aircon won't work unless the fan is on.
If the blower continues to work, but aircon no longer does, then contact an aircon specialist.HJ, in the GolfV review, reports of problems with the aircon compressor (though I had no problems with my 2005 Golf during 160k miles from new)
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