What are the most common issues with the Audi 80 air conditioning system and how can they be resolved?

I have recently purchased a used Audi 80 and noticed that the air conditioning is not working properly. It does not blow out cold air and there is a strange smell coming from the vents. I want to know what could be causing these issues and what steps I can take to fix them.

One of the most common issues with Audi 80 air conditioning systems is a low refrigerant level. This can be resolved by having a certified technician recharge the system with refrigerant. It is also important to check for any leaks in the system to prevent future issues.