Why does my Audi A5 make a squealing noise when I turn on the AC?

Recently, whenever I turn on my AC in my Audi A5, it makes a loud squealing noise. It never used to do this before. What could be causing this noise and how can I fix it?

There are a few potential causes for your Audi A5's squealing noise when you turn on the AC. It could be due to a worn or loose AC belt, a malfunctioning AC compressor, or low refrigerant levels. I recommend taking your car to a trusted mechanic to diagnose and fix the issue as soon as possible.