How to troubleshoot the Audi A1's air conditioning system?

I recently noticed that my Audi A1's air conditioning system is not cooling properly. What could be the possible causes for this issue and what steps can I take to fix it?

First, check the air conditioning compressor belt to make sure it is not worn or damaged. Next, inspect the refrigerant levels and add more if needed. You can also try cleaning the air filter and checking the condenser for any debris.

If the above steps don't solve the issue, it could be a problem with the compressor itself. It might need to be replaced or repaired by a professional. It's also possible that there is a malfunction in the electrical components of the system.