Recently I notice when I have the heating in operation at 22 degrees synchronized the after some time cooler air out of the heating comes no matter from which outlet I have set the ventilation. If then I change then also the air will automatically get warmer again which is actually not normal.I think if I set a temperature should also keep the temperature constant. At VW dealer I was therefore still not thinking that I might be a little wrong m ache just wouldn’t know what. Maybe someone has an idea or can give me a hint what it might be