Now all models of Audi have a well-designed climate control system that can define as a hands-free temperature regulator for keeping you cool and comfortable inside the car. When you set the temperature of the Audi in the climate control system, it will maintain that temperature without impacting the outside temperature. Go through the video to know about the signs to diagnose the failed climate control system in Audi A4.
https://www.youtube.com/watch?v=4SH9ZpvUsH8