How to troubleshoot noise from the AC compressor in my Audi 80?

Recently, my Audi 80 has been making strange noises whenever I turn on the AC. It sounds like a whirring noise and sometimes there are rattling sounds as well. I'm not sure what's causing it, but I want to fix it before it gets worse. Any ideas on how to troubleshoot and resolve this issue?

It sounds like there may be an issue with the AC compressor. One possible solution is to check the compressor's belt and see if it needs to be replaced. You can also try lubricating the compressor to see if that reduces the noise. If those methods don't work, it may be best to take your car to a professional mechanic for further inspection.