I'm out of ideas with this -

The output of the climate control unit (C1) is connected to the blower unit for speed control and also to the AC temp/pressure sensor - The connection is a LIN signal.
The speed control of the blower works fine - the AC pressure temp sensor shows no signal/communication in VCDS.
The line from the pressure sensor to the climate control has continuity as does the connection to the blower motor - This connection parallels in a connector in the ECU box.

The AC pressure sensor shows 51 BAR in VCDS.....it shows the same if I disconnect the sensor!! -
I'm thinking that the new (from Audi) sensor is faulty...