Heating problems
If coolant does flow out of the heater core, then you need to start looking at the flaps that control the air mix in the cabin. For whatever reason, 1 or more of them are jammed, and it's not mixing in enough hot air.
Bringing Audi to Life for Audi Fans
It seems like a stuck thermostat or low coolant level, but the coolant temps seems to be normal and the coolant tank is full.


