How can I fix my Audi 80's malfunctioning air conditioning system?

My Audi 80's air conditioning system is blowing out warm air instead of cold air. What could be the cause of this issue? How can I troubleshoot and fix it?

Check if your air conditioning compressor is functioning properly by turning on the AC and checking if the clutch on the compressor engages. If it does not, it could be a sign of a faulty compressor or a low refrigerant level.

Inspect the AC system for any leaks and ensure all connections and seals are tight. Leaks can cause a loss of refrigerant and result in warm air blowing out. Consider using a UV dye to identify any leaks.