Intermittent aircon fault

[iipaul]

I have recently bought a 2018 75bhp berlingo and the air con didn’t work when I bought it, so had it regassed and pretty sure it had some aircon repair fluid chucked in when it was gassed, it worked great for a couple of weeks then stopped working so assumed it had a leak still.
Anyway fast forward to my mot recently I asked the garage to look at the aircon and see if they can find the leak they put a leak tracer in the system and said if it stops working we’ll see it with a Uv light, again two weeks later stops working and went back in for a cambelt and asked them to look at it again and he rung me saying it works good and has gas in it there’s no issue, worked fine after I picked it up from them but gone to use it again today and it’s stopped working! 
Anyone got any suggestions?

[shtu]

Well, they've used the uv dye, so first stop is get them to have another look over it. 9 times out of 10, the condenser has rotted out somewhere. Alternatively, if there's no leak they will be able to check the system pressure. If that's still OK, it's probably a pressure switch or associated wiring.

You might be better served with a mobile AC specialist rather than a general garage - most garages only know how to do what the machine tells them to.