How to troubleshoot faulty air conditioning in my Audi A6?

I've noticed that the air conditioning in my Audi A6 is not cooling as well as it used to. What could be causing this issue and how can I fix it?

First, check if your AC filter needs to be replaced. A dirty filter can restrict airflow and cause cooling issues.

You may also want to check if your AC compressor is functioning properly. This is responsible for circulating refrigerant and if it's not working, your AC won't cool properly.

Check your car's refrigerant levels, as low levels can also lead to poor cooling performance.