How to troubleshoot a non-functional air conditioning system in an Audi 80?

My air conditioning in my Audi 80 has suddenly stopped working. I have checked the fuses and they seem to be fine. What could be the issue and how can I fix it?

First, try checking the AC compressor to see if it is running. If it is not, there may be an issue with the compressor or the wiring to it. If it is running, then the issue may be with the refrigerant levels. Low refrigerant can cause the AC to stop working. Consider getting it recharged professionally or try doing it yourself if you have the tools and knowledge. If none of these solutions work, it may be best to take it to a mechanic for further inspection.