Checked mine the other day and my TDi300 puts out between 2 degrees C and 4 degrees C when outside ambient was 20 degrees C
You can feel the pipes on the air con compressor, the high pressure side should get very hot and the low pressure pipe cold (but not necessarily freezing) and the clutch should cycle between engaging/disengaging.
If you have taken the viscous fan off, then you are relying on the twin electrics to cool the air con condenser radiator, that may make a difference as they don't flow anywhere near the same amount of air through the radiators compared to the standard fan.
Also worth bearing in mind it's quite a large cabin space too cool.
Cheers