OOps I read this thread...
Today I was in the car and in the afternoon I decided to switch the air con on. It's an 04 A3 1.9 tdi Sport. It was running for about 5 minutes when I realised that the air was not getting colder. I checked the fuses and they were all OK. I did notice a strange noise coming from the pulley area in the engine bay. It sounds like a "loose brake pad" you know the noise !
I then tried various setting etc to no avail.
Now this is the odd thing. I cannot get any heat out of the vents either !!
My initial diagnosis is Air con compressor has died.
Is there anything else that I should look for ? (i.e Sticking relay preventing the pump to kick in)
I hope that someone here can help.