What are the most common causes of a malfunctioning air conditioner in an Audi 80?

I've been experiencing issues with my air conditioner in my Audi 80. What could be causing it to malfunction and how can I fix it?

The most common cause of air conditioner malfunctions in an Audi 80 is a faulty compressor or compressor clutch. It is recommended to have a certified mechanic inspect and replace any faulty components.

Another possible cause of air conditioner issues in an Audi 80 is a refrigerant leak. This can be identified and repaired by a certified technician.