Why does my Audi A2 make a loud noise when I turn on the air conditioning?

I recently purchased a used Audi A2 and every time I turn on the air conditioning, it makes a loud noise. It sounds like a fan is rubbing against something. What could be causing this and how can I fix it?

Based on your description, it sounds like there may be an issue with the fan or a loose component in the air conditioning unit. It's best to have a mechanic check it out to determine the specific cause and necessary repairs.

I experienced a similar issue with my Audi A2 and it turned out to be a faulty fan motor. It was a relatively easy and inexpensive fix at the dealership. I suggest taking it in for a diagnostic test.