Why is my Audi A1 making a strange noise when I turn on the AC?

I recently noticed that my Audi A1 makes a strange rattling noise when I turn on the AC. It's not a constant noise, but it happens every time I start the car and turn on the AC. What could be causing this and is it something I should be concerned about?

It's possible that the noise is coming from the AC compressor. This could be a sign that it needs to be replaced or there could be debris caught in it. It's best to have a mechanic take a look at it to diagnose the issue and determine if it needs to be fixed.