Good evening, dear community! I drive a Lupo GTI from 2001. I took over this with defective air conditioning. It was due to the contrast medium to see that a line was broken. I renewed it. Of course I previously sucked off the refrigerant. I filled the system with expectations again with 750g, because I installed a sand compressor. I started the car, pressed the AC button, the compressor also switches, noticeably, but the cooling power stays out. The device again plugged in, run and observe the pressures. It is noticeable that the pressure is not constant, but fluctuates on the high and low pressure side between 7,9-8,3 bar. The pointers fail. Not very much, but I think this is not normal. I also evacuated the system before the filling. Do you have tips on what I can do? On suspicion of changing the compressor? A KFZ electrician told me that the compressor can switch off, but that the power of the compressor is not normal. I also evacuated the system before the filling.