Having a nightmare with my air con after upgrading to double Din. Can't get it to work when air con switch is on - Dealers have checked it and want to take the dash out to get at temp switch and they only replaced compressor 7 months ago. I originally put in a facelift unit but since having problems have changed it back to old version but both are the same.
Audi say compressor works and pipes get cold but as soon as you switch air con button its like it turns the vents off (if that makes sense).
Anyone got any ideas.