Cooling module for cooling a motor vehicle engine, comprising: - a first loop for cooling a first heat-transfer fluid bound for the engine, - a second loop for cooling a second heat-transfer fluid, having a heat exchanger of the charge-air cooler type, the cooling module also comprising a third loop for heating the second heat-transfer fluid bound for the heat exchanger, which third loop is coupled to a heat source, the third loop being connected to the first, cooling loop and to the second loop for cooling the second heat-transfer fluid, the heat source is integrated in the first, cooling loop and is connected to the second, cooling loop, the heat source being a latent heat source and comprising a heat accumulator configured to: - store the heat from the first heat-transfer fluid circulating in the first, cooling loop during a first phase, and to - pass on the heat from said accumulator to the second heat-transfer fluid bound for the heat exchanger during a second phase, the cooling module comprising a first regulating means for allowing or preventing the circulation of the heat-transfer fluid of the first, cooling loop through the accumulator and a second regulating means for allowing or preventing the circulation of the heat-transfer fluid bound for the heat exchanger through the accumulator, characterized in that the first loop for cooling the first heat-transfer fluid bound for the engine has a first radiator and the second loop for cooling the second heat-transfer fluid comprises a second radiator, the second regulating means being configured to allow the circulation of the second heat-transfer fluid bound for the heat exchanger through the accumulator and interrupt the circulation of the second heat-transfer fluid in the second radiator, during the second phase of passing on the heat, the first radiator comprising at least one header tank for the first heat-transfer fluid, the heat source being arranged in said at least one header tank. - a first loop for cooling a first heat-transfer fluid bound for the engine, - a second loop for cooling a second heat-transfer fluid, having a heat exchanger of the charge-air cooler type, the cooling module also comprising a third loop for heating the second heat-transfer fluid bound for the heat exchanger, which third loop is coupled to a heat source, the third loop being connected to the first, cooling loop and to the second loop for cooling the second heat-transfer fluid, the heat source is integrated in the first, cooling loop and is connected to the second, cooling loop, the heat source being a latent heat source and comprising a heat accumulator configured to: the cooling module also comprising a third loop for heating the second heat-transfer fluid bound for the heat exchanger, which third loop is coupled to a heat source, the third loop being connected to the first, cooling loop and to the second loop for cooling the second heat-transfer fluid, the heat source is integrated in the first, cooling loop and is connected to the second, cooling loop, the heat source being a latent heat source and comprising a heat accumulator configured to: - store the heat from the first heat-transfer fluid circulating in the first, cooling loop during a first phase, and to - pass on the heat from said accumulator to the second heat-transfer fluid bound for the heat exchanger during a second phase, the cooling module comprising a first regulating means for allowing or preventing the circulation of the heat-transfer fluid of the first, cooling loop through the accumulator and a second regulating means for allowing or preventing the circulation of the heat-transfer fluid bound for the heat exchanger through the accumulator, characterized in that the first loop for cooling the first heat-transfer fluid bound for the engine has a first radiator and the second loop for cooling the second heat-transfer fluid comprises a second radiator, the second regulating means being configured to allow the circulation of the second heat-transfer fluid bound for the heat exchanger through the accumulator and interrupt the circulation of the second heat-transfer fluid in the second radiator, during the second phase of passing on the heat, the first radiator comprising at least one header tank for the first heat-transfer fluid, the heat source being arranged in said at least one header tank. the cooling module comprising a first regulating means for allowing or preventing the circulation of the heat-transfer fluid of the first, cooling loop through the accumulator and a second regulating means for allowing or preventing the circulation of the heat-transfer fluid bound for the heat exchanger through the accumulator, characterized in that the first loop for cooling the first heat-transfer fluid bound for the engine has a first radiator and the second loop for cooling the second heat-transfer fluid comprises a second radiator, the second regulating means being configured to allow the circulation of the second heat-transfer fluid bound for the heat exchanger through the accumulator and interrupt the circulation of the second heat-transfer fluid in the second radiator, during the second phase of passing on the heat, the first radiator comprising at least one header tank for the first heat-transfer fluid, the heat source being arranged in said at least one header tank.