an air flow mixing system for a vehicle air conditioning system having a distribution door to force air from a first air flow to mix with a second air flow of different temperature proximate a merging region in the air conditioning system . in one embodiment , the distribution door has an arcuate passageway or scoop to forcibly route air from the first airflow to the second airflow . in a second embodiment , the distribution door has at least one projecting channel to divide each of the first and second air flows into a plurality of alternating flow paths to promote heat transfer and mixing of the two airflows . in each embodiment , the pivoting distribution door facilitates heat transfer between the airflows resulting in a more even temperate airflow emerging from the merging region .