Climate compressor possibly defective: original part or cheap product?

Hello, you’ve probably heard and treated it a thousand times: V50, 2.4 140Ps Benziener Bj 2004 140,000 Km climate works about 10 minutes – then it stops abruptly and goes back the next day. The free person changed the temperature sensor – he cools over an hour – when driving still only 10 minutes. Now he says: Compressor is probably defective then. Magnet couplings exchange individually he advises (why always off) Now the question: Do you know the problem au s? How would you proceed? Are there possibly new compressors from cheap manufacturers (under 300 €) or are they not advisable to install? The car is just a bit older and I didn’t want the Mega Premium climate solution now… Thank you for your ideas/opinions on this arduous topic.