Audi A6 2012 2.0 TDi A/C Issue

Hello.

Helped a friend today with an A/C problem on his Audi Avant A6 2012 2.0 TDi 177HP.
Problem is that the A/C is not cooling.
We checked the standby pressure with manometer and read 5bar.
I think that's is enough. Starting the car, and the low pressure decrease a little bit, and the high pressure increase a little bit.
Maybe just 1bar up and down. No click from the clutch.
Hooked up Autocom and start read some data.
It say 5,6bar at standby, almost like the manometers, and 6,4 at engine running and full A/C. That is too almost as manometer reading.
The A/C pipe feels a little colder when A/C is activated.
We also read out that the current to compressor is 600mA, when A/C activated. Think this is for the clutch or?
We also read A/C compressor torque 0,6474 Nm when A/C is off and 4,5318 Nm when A/C is on.
Is that the torque that compressor draws? How is the value measured?
It seems like the compressor just runs a "little"?
We find no any DTC. Coolant fan runs fine.
I do not have the car at my place, but how shall we continue the troubleshooting?

Thank you very much.