N16 Air conditioning problem.

Hiya. My wife recently inherited this car so I've been trying to get it back up to scratch.

Next issue is the Aircon. Have filled it with gas and checked for leaks, it's holding the gas fine. Now the pulley is engaging too.
However, the cooling effect is absolutely minor. It's definitely colder to just open the windows or turn the AC off and leave the fans blowing.

Where do I look next please?
Thanks in advance.
Have changed the oil and replaced the cabin filter. Still just warm air blowing.
I can hear and see the pulley engage, revs drop, there's an initial puff of cold air then it just goes to warm.

I've gotta say, I've worked on a lot of cars and this is the first forum where 40 odd people read your request for help and seemingly have no idea where to look :confused:
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