How to troubleshoot a malfunctioning air conditioning system in Audi 80?

My Audi 80's air conditioning system is not working properly. The air blowing out is not cold enough and there is also a strange smell. What could be causing this issue and how can I fix it?

First, check the refrigerant levels in your air conditioning system. If they are low, it could be a sign of a leak. Make sure to have the leak repaired and then recharge the system with the correct amount of refrigerant.

Another possible cause could be a faulty compressor. This can be confirmed by checking if the compressor clutch is engaging properly. If not, it may need to be replaced.