The invention relates to a motor vehicle air conditioning device comprising a chamber enclosing a heat exchanger of the evaporator or radiator type intended to have passing through it in parallel a first stream of air and a second stream of air, this device comprising, upstream of the exchanger, a distributor to adjust the distribution of the sections for the passage of the first stream of air and of the second stream of air through the section of the heat exchanger. This distributor comprises a duct (5) incorporating several distinct parallel channels (5A-5D) opening together into a face of the heat exchanger, and a distribution flap (18) mounted at the inlet of this duct (5) so that the orientation of this distribution flap (18) determines the number of channels carrying the first stream to the exchanger and the number of channels carrying the second stream to the exchanger.
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