NOVELTY - The vehicle comprises a cooling circuit for cooling a fuel cell system, where the cooling circuit comprises a cooling heat exchanger (6), a coolant conveying device (12), an air conditioning device and a heat exchanger in a fuel cell stack (11) of the fuel cell system. The airstream (F) flows against on the cooling heat exchanger as cooling air. The cooling heat exchanger has two stages, which are designed in such a way that the relative wind flows through the two stages consecutively in series. The two stages of the cooling heat exchanger are flowed serially to each other.    USE - Used as vehicle.    ADVANTAGE - The vehicle can be operated with good performance and low energy cost.    DETAILED DESCRIPTION - The vehicle comprises a cooling circuit for cooling a fuel cell system, where the cooling circuit comprises a cooling heat exchanger (6), a coolant conveying device (12), an air conditioning device and a heat exchanger in a fuel cell stack (11) of the fuel cell system. The airstream (F) flows against on the cooling heat exchanger as cooling air. The cooling heat exchanger has two stages, which are designed in such a way that the relative wind flows through the two stages consecutively in series. The two stages of the cooling heat exchanger are flowed serially to each other from a cooling medium flowing in the cooling circuit. The stage finally flowing from the air stream is first flowed from the cooling medium. The cooling circuit is formed as high temperature-cooling circuit for cooling of the fuel cell stack and comprises a first section as high temperature-cooling circuit for cooling the fuel cell stack. A second section is formed as low-temperature cooling circuit for cooling electrical and/or electronic components parallel to the heat exchanger, where the low-temperature cooling circuit is arranged parallel to the two stages of the cooling heat exchanger so that a low-temperature cooling heat exchanger (20) is flowed from the airstream serially to the two-stages of the cooling heat exchanger. The low-temperature cooling heat exchanger is arranged so that it is flowed from the airstream serially before the two stages of the cooling heat exchanger. The two stages of the cooling heat exchanger are arranged in front area of the vehicle. A blower is arranged in the area of two stages of the cooling heat exchanger and if necessary the low temperature-cooling heat exchanger. The two stages of the cooling heat exchanger have surfaces illuminating from the airstream and are arranged to each other as stack. The fuel cell stack is formed as stack of proton exchange membrane fuel cell. The air conditioning device comprises an air conditioning heat exchanger in order to cool the air-conditioning agent used in the air conditioning device. The air conditioning heat exchanger is formed in dependent upon the cooling circuit for the fuel cell system. The air conditioning heat exchanger is formed in or before a wheel housing of the vehicle. The air supply is carried out to the air conditioning heat exchanger through the wheel housing of the vehicle or lateral air inlet in the lower area of the front of the vehicle during the air discharge is carried out through openings in a mudguard in the area of the wheel housing. The area of the air supply is arranged in slight height over the road than the openings for air discharge.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of a cooling circuit of a vehicle.    Electric and/or electronic component (3, 4)    Cooling heat exchanger (6)    Fuel cell stack (11)    Coolant conveying device (12)    Low temperature-cooling heat exchanger. (20)