Hi guys
About 3 weeks ago my AC packed up so looked online for a fix, and ordered a air conditioning pressure switch 4H0959126B.
Fitted the switch this morning and hey presto I now have full AC again, just in case anyone has no AC try this before you go to the dealer.
The switch is located on the right hand side of the condenser in front of the radiator when looking from the front of the car.
Make sure the engine is cold so not to loose any fluid on the A6 C7 you only have to take of the plastic cover on top of the grill,
then unscrew the sensor and replace with the new one an easy fix for about 20 quid.
Hope this will help some off you out.
cheers
Stewart.