Air conditioning not blowing cold air?

Thank you. Recently an electrician fixed me problem of window up and down button. Windows stopped working and it was issue of window automatic liter unit. He disconnected the unit and now windows work but only manually. After he finished work, I saw the A/C was not working anymore and it was blowing regular air. Not cold. I told him that he checked fuse, and said everything was okay and the A/C issue was not related to this. He sent me to an A/C specialist. This one added A/C gas to the system. From 320g up to 510g. But it still was not working, I came home now try to figure out what can be issue, as these guys I do not trust, they take money and don't fix if they fix something else brakes. The next day A/C started working when the engine started but after a short time it started to disconnect. And finally stopped. Every time I start engine when it's cool its working but when after a little over 5 minutes starts to connect and disconnect and finally stops.

This is the diagram I found. No relay for A/C but maybe its somehow about number 6 or 7?

I think I do. Besides, I pay attention that A/C stops when engine goes under 1,200 RPMs. When I was driving it was working at least yesterday, I was driving nighttime, and it was like this. I am at a traffic light it starts to make noise and turns off and on. When I add RPMs it stops to turn off. But it's at night. I want also to try daytime, when it's hot outside.