Method for ventilating a ram air channel for a vehicle, said ram air channel comprising: - a ram air inlet capable of receiving an air flow at ram air pressure under the effect of a movement of the vehicle, - at least one heat exchanger arranged to be able to receive at least one portion of said ram air flow, method in which the ram air channel is provided with at least one jet pump arranged to be able to be fed with compressed air delivered by compressed air sources (13, 17) of the vehicle, characterised in that the jet pump is a multiple-jet pump: - comprising a plurality of compressed air inlets (34, 38) and a plurality of compressed air outlet nozzles (44, 48), each nozzle (44, 48) being connected to at least one of said compressed air inlets (34, 38), - of which said compressed air inlets (34, 38) are connected to a plurality of compressed air sources (13, 17) of the vehicle, - of which a first nozzle is connected to at least one first compressed air inlet connected to at least one first compressed air source of the vehicle, this first nozzle being able to receive compressed air delivered by at least one such first compressed air source of the vehicle, - of which at least one nozzle, named second nozzle, separate from said first nozzle is: ∘ isolated from each first compressed air inlet, ∘ connected to at least one inlet, named second compressed air inlet: ▪ separate from each first compressed air inlet, ▪ and connected to at least one compressed air source of the vehicle, named second compressed air source, separate from each first compressed air source, each second nozzle being able to receive compressed air delivered by at least one such second compressed air source without being able to receive compressed air delivered by any first compressed air source. - a ram air inlet capable of receiving an air flow at ram air pressure under the effect of a movement of the vehicle, - at least one heat exchanger arranged to be able to receive at least one portion of said ram air flow, - comprising a plurality of compressed air inlets (34, 38) and a plurality of compressed air outlet nozzles (44, 48), each nozzle (44, 48) being connected to at least one of said compressed air inlets (34, 38), - of which said compressed air inlets (34, 38) are connected to a plurality of compressed air sources (13, 17) of the vehicle, - of which a first nozzle is connected to at least one first compressed air inlet connected to at least one first compressed air source of the vehicle, this first nozzle being able to receive compressed air delivered by at least one such first compressed air source of the vehicle, - of which at least one nozzle, named second nozzle, separate from said first nozzle is: ∘ isolated from each first compressed air inlet, ∘ connected to at least one inlet, named second compressed air inlet: ▪ separate from each first compressed air inlet, ▪ and connected to at least one compressed air source of the vehicle, named second compressed air source, separate from each first compressed air source, ∘ isolated from each first compressed air inlet, ∘ connected to at least one inlet, named second compressed air inlet: ▪ separate from each first compressed air inlet, ▪ and connected to at least one compressed air source of the vehicle, named second compressed air source, separate from each first compressed air source, ▪ separate from each first compressed air inlet, ▪ and connected to at least one compressed air source of the vehicle, named second compressed air source, separate from each first compressed air source,