本发明涉及一种操作机动车辆，所形成的一个作为内燃机（6）机和作为电机（4）设计的机器，其特征在于，所述车辆用这些机器中的至少一个被驱动的，两台机器（在一个共同的冷却剂循环的方法 10）用冷却剂冷却，（6）的电机（4）的下游侧连接在所述内燃机的所述冷却剂最初到电机（4）和（4）的电机（内燃6）发动机的输送，其中，用于所述 冷却装置包括一个第一温度设定，当机动车辆仅由内燃机（6）被驱动，并且被设置为第二温度下的冷却剂，在由所述电机（4）和所述内燃机的机动车辆（6）被驱动，其特征在于 第二温度低 他是第一个温度。

The invention relates to a method of operating a motor vehicle, the formed one as a internal combustion engine (6) machine and as an electric machine (4) designed machine, wherein the vehicle is driven with at least one of these machines, both machines (on a common coolant loop 10) are cooled with a cooling agent, the internal combustion engine (6) of the electric machine (4) is connected downstream of said coolant initially to the electric machine (4) and (4) of the electric machine (to the internal combustion engine 6) is conveyed, wherein for the cooling means comprises a first temperature is set, when the motor vehicle only by the internal combustion engine (6) is driven, and being set to a second temperature for the coolant, when the motor vehicle by the electric machine (4) and the internal combustion engine (6) is driven, wherein the second temperature is low it is than the first temperature.