WRK Stewart

Hi all I have a 2016 Q5 and the air blowing from the heater vents is not all that warm. Some vents blow warm and others are blowing cold. The car engine temp is 90 degrees c but the warm air is nothing special from heater. I flushed the heater core which has improved slightly but still not great. It’s a dual climate control system. Anyone run into this issue with Q5?