This has occurred occasionally with every Audi I've had with air-conditioning and I've always fixed it by:
(1) Make sure the engine is fully warmed up and running.
(2) Switch air-conditioning on and wind the temperature all the way UP to MAX.
(3) Swelter like a pig for about five minutes.
(4)...
I've just picked up a used (!) B8 A4 2.0TDI SE. I'll not be too specific about the details, but it was apparently a customer order that was correct, apart from the colour. Needless to say, I got a good price reduction from list price for less than 1500 miles on the clock.
The good? Nice...
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