Why do Audi A4 air conditioning not work after engine start?

I have noticed that every time I start my Audi A4, the air conditioning does not work at first and takes a while to start functioning. What could be the possible cause of this issue and how can it be fixed?

The most common reason for your air conditioning not working right after starting your Audi A4 is a faulty compressor. It may be low on refrigerant or have a damaged clutch. It is recommended to get it checked by a professional mechanic to properly diagnose and fix the issue.

Another possibility could be a malfunctioning AC relay switch. This can be easily checked and replaced, if necessary, by a mechanic. Also, make sure that the AC system is properly charged with refrigerant.