Why does my Audi A4 make a strange noise when I turn on the air conditioning?

I've noticed that whenever I turn on the air conditioning in my Audi A4, there is a strange noise coming from the engine. It almost sounds like a rattling noise. Is this normal, or could it be a sign of a bigger issue?

It's always important to keep an ear out for any strange noises coming from your car. In this case, the rattling noise could be an indication of a faulty AC compressor or a loose pulley. I would recommend taking your car to a trusted mechanic to have it checked out.

I experienced the same issue with my Audi A4. After doing some research, I found out that it could be caused by a failing AC clutch. I took my car to the dealership and they were able to fix it for me. It's always better to get it checked out to avoid any potential problems down the road.

It's possible that the noise is caused by a loose belt or low refrigerant level. It's important to get this checked out as soon as possible, as it could lead to more serious issues with your AC system. I would recommend taking it to a mechanic who has experience with Audi vehicles.