Maximum ram air is available on the ground and on take-off. In-flight there is less cooling requirement so it is modulated by the doors and louvers which reduces both the ram air flow and also drag. The deflector doors are extended whenever the aircraft is on the ground.
The RAM DOOR FULL OPEN lights will be illuminated on the ground and should extinguish during the climb. If they do not, then either the cabin is still very hot and the packs require full ram airflow for cooling or the heat exchanger may be faulty.