How do I troubleshoot the air conditioning system in my Audi A3?

My Audi A3's air conditioning system seems to be blowing out warm air instead of cold. How can I diagnose and fix this issue?

First, check the refrigerant level in your car's air conditioning system. Low refrigerant can cause the air to blow out warm instead of cold. If the refrigerant is low, you may have a leak and will need to get it repaired.

Another potential issue could be a faulty compressor. If the compressor is not functioning properly, it can affect the temperature of the air blowing out of the vents. Have a mechanic inspect the compressor and replace it if necessary.

Check the cabin air filter in your Audi. If it's dirty or clogged, it can restrict air flow and make the air feel warmer. Replace the filter if needed.