Bought car a couple of months ago. A/C wasn’t getting cool at all, so I had a mobile tech come to home address from Cool Car (UK) at a cost of £50.Herecharged it and it was working well for a couple of days but then it was back to blowing out air that wasn’t cool even on max A/C. So, he came back out and checked for vacuum leaks and there wasn’t any; checked pressure readings which were ok and did another recharge. Same thing happened; ok for a couple of days then back to how it was. Texted him asking what else it could be but no reply. Any idea what’s going here? I don’t know if the car has ever had a full A/C service.

 

If adding refrigerant temporarily corrects the problem that tells us the refrigerant is leaking out.
Do you know if the mobile tech used leak detector, if not , he should have !