How can I troubleshoot the AC system in my Audi 80?

I recently noticed that my Audi 80's AC system is not functioning properly. Whenever I turn it on, the air blows out warm and doesn't cool down the car. What could be causing this issue and how can I fix it?

Check the AC compressor and make sure it is not blocked or damaged. You can also try cleaning the air filter to improve air flow.

Make sure the AC refrigerant levels are topped up and not leaking. It could also be a problem with the AC condenser, so have it checked by a professional mechanic.