John Wire

Hi. I have a 2017 S5 where overall I've had no real problems since getting it last year. That being said, just now I put the heating on and it seems to only blow tepid despite it being cranked up to the highest setting. I've turned the sync settings on and off for the passenger side and rear however it still blows tepid or freezing cold if the air con is on. Any help on this would be greatly appreciated. John