To enable utilization of a heat core as a heat radiator as well in a cooperative cooling system of a fuel cell and air conditioning.

In the cooperative cooling system of the fuel cell and the air conditioning, changeover of the air sending direction related to the heat core is carried out as follows. First, it is determined whether or not an FC cooling water temperature θFCexceeds a threshold water temperature θH(S10), and when the determination is affirmed, a three-way valve is put into a coupled state (S12). Then, when it is determined whether or not there is a cooling demand in an air conditioning system (S14) and there is the cooling demand, since the air dissipated by the heat core cannot be sent into a vehicle room, the cooling demand is defined as the air sending direction in a radiation mode for directing the wind direction of a blower toward the outside of the vehicle room (S16). When the determination of S14 is not affirmed, since the air dissipated by the heat core can be sent into the vehicle room, the cooling demand is defined as the air sending direction in a warming mode for directing the wind direction of the blower toward the inside of the vehicle room (S18).

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