Why is my Audi A3 making a strange sound when I turn on the AC?

I recently noticed that whenever I turn on the AC in my Audi A3, I hear a strange sound coming from the engine. It only happens when the AC is on and goes away when I turn it off. What could be causing this and how can I fix it?

It's possible that your AC compressor is struggling to work properly, causing the strange sound. I would recommend taking your car to a mechanic to get it checked out before it potentially leads to more issues.

Another potential cause could be a faulty belt in your AC system. This can easily be fixed by replacing the belt. It's important to address this issue sooner rather than later to avoid any further damage to your car's AC system.

It's also common for debris and dirt to build up in the AC system, causing strange sounds. I would suggest getting your AC system cleaned and serviced regularly to prevent this issue.