Audi A4 B8 A/C wont stay on.

AudiG12KPM

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My ac had been working, I have it on all the time, I did an active test on heating for some reason. Now the AC wont stay on. Can anyone help me.
 
Let me guess the AC button only lights up when you press it? You might need to perform first run on the compressor (with the engine running). I had something similar after performing a reset in the HVAC module.
 
Yeah, I found out how to do it in the end, I did it before but couldn't remember how, but thanks for the reply thought I'd never get one aha.