Hybrid vehicle having, as a changeable drive, an internal combustion engine, an electric drive and two cooling circuits (KK1, KK2), - in which the internal combustion engine has a first cooling circuit with a heat carrier and with a cooler, wherein the first cooling circuit is intended to take up heat of the internal combustion engine, and to conduct said heat to the cooler, by means of the heat carrier in order to make it possible for the heat to be dissipated to surroundings of the internal combustion engine, - in which the electric drive has a second cooling circuit with a heat carrier and with a cooler, wherein the second cooling circuit is intended to conduct heat of components of the electric drive to the cooler by means of the heat carrier in order to make it possible for the heat to be dissipated to surroundings of the electric drive, - in which a pre-heating circuit is arranged between the first cooling circuit and the second cooling circuit, - in which the pre-heating circuit is connected to the first cooling circuit via two connecting points (VP1, VP2) in such a way that the heat carrier of the first cooling circuit circulates through components of the pre-heating circuit, - in which the pre-heating circuit and the second cooling circuit have a heat exchanger as a common component and are thermally coupled by the heat exchanger in such a way that heat is controllably exchangeable between the heat carriers (102, 202) of the two cooling circuits (KK1, KK2), - in which the pre-heating circuit has an electrical auxiliary heater which is connected in series with the heat exchanger so that the electrical auxiliary heater and the heat exchanger are likewise flowed through by the heat carrier of the first cooling circuit, and - the electrical auxiliary heater is arranged and designed in such a way that heat generated by it is transferable according to requirement into at least one of the two cooling circuits (KK1, KK2), - in which the second cooling circuit has, in addition to the heat carrier, the components of the electric drive, the heat exchanger, a pump and the cooler, which, as seen in the flow direction of the heat carrier, are connected in such a way: - that the heat carrier passes from the components to the pump, - that the heat carrier passes from the pump directly to the cooler, on the one hand, and from the pump to the cooler via the heat exchanger, on the other hand, - that the heat carrier passes from the cooler back to the components in order to take over the heat generated during the operation of the components. - in which the internal combustion engine has a first cooling circuit with a heat carrier and with a cooler, wherein the first cooling circuit is intended to take up heat of the internal combustion engine, and to conduct said heat to the cooler, by means of the heat carrier in order to make it possible for the heat to be dissipated to surroundings of the internal combustion engine, - in which the electric drive has a second cooling circuit with a heat carrier and with a cooler, wherein the second cooling circuit is intended to conduct heat of components of the electric drive to the cooler by means of the heat carrier in order to make it possible for the heat to be dissipated to surroundings of the electric drive, - in which a pre-heating circuit is arranged between the first cooling circuit and the second cooling circuit, - in which the pre-heating circuit is connected to the first cooling circuit via two connecting points (VP1, VP2) in such a way that the heat carrier of the first cooling circuit circulates through components of the pre-heating circuit, - in which the pre-heating circuit and the second cooling circuit have a heat exchanger as a common component and are thermally coupled by the heat exchanger in such a way that heat is controllably exchangeable between the heat carriers (102, 202) of the two cooling circuits (KK1, KK2), - in which the pre-heating circuit has an electrical auxiliary heater which is connected in series with the heat exchanger so that the electrical auxiliary heater and the heat exchanger are likewise flowed through by the heat carrier of the first cooling circuit, and - the electrical auxiliary heater is arranged and designed in such a way that heat generated by it is transferable according to requirement into at least one of the two cooling circuits (KK1, KK2), - in which the second cooling circuit has, in addition to the heat carrier, the components of the electric drive, the heat exchanger, a pump and the cooler, which, as seen in the flow direction of the heat carrier, are connected in such a way: - that the heat carrier passes from the components to the pump, - that the heat carrier passes from the pump directly to the cooler, on the one hand, and from the pump to the cooler via the heat exchanger, on the other hand, - that the heat carrier passes from the cooler back to the components in order to take over the heat generated during the operation of the components. - that the heat carrier passes from the components to the pump, - that the heat carrier passes from the pump directly to the cooler, on the one hand, and from the pump to the cooler via the heat exchanger, on the other hand, - that the heat carrier passes from the cooler back to the components in order to take over the heat generated during the operation of the components.