System for producing and managing refrigeration by an absorption machine from residual energy from a combustion engine comprising - an exhaust gas discharge line of an internal combustion engine, - a cooling circuit of the internal combustion engine intended to receive a cooling liquid, - an absorption machine comprising a generator to produce refrigeration from a heat source coming from the residual energy of the combustion engine comprising at least partially the residual heat from the exhaust gases of the combustion engine and the residual heat of the cooling liquid of the cooling circuit of the combustion engine, - a heat exchanger arranged on the exhaust gas discharge line, - a coupling circuit configured to ensure the fluid connection of the cooling circuit to the heat exchanger, of the heat exchanger to the generator, of the generator to the cooling circuit so as to transfer to the generator, the residual heat from the cooling circuit and the residual heat from the exhaust gases, where it comprises: - an intermediate circuit configured to ensure the fluid connection of the heat exchanger to the generator and of the generator to the heat exchanger so as to transfer the residual heat from the exhaust gases to the generator without fluid connection to the cooling circuit, by decoupling the cooling circuit without fluid circulation between the intermediate circuit and the cooling circuit, - a heating circuit configured to ensure the fluid connection of the cooling circuit to the heat exchanger and of the heat exchanger to the cooling circuit advantageously without fluid connection to the generator, and - a circuit management module comprising valves (3, 4, 5, 6) configured to orient the cooling liquid according to the circuit to be used, characterised in that the circuit management module is configured to control the opening and the closing of the valves (3, 4, 5, 6), to ensure the circulation of the cooling liquid in the cooling circuit and in a decoupled manner in the intermediate circuit, when the temperature of the cooling liquid at the outlet of the combustion engine is less than a predefined threshold temperature. - an exhaust gas discharge line of an internal combustion engine, - a cooling circuit of the internal combustion engine intended to receive a cooling liquid, - an absorption machine comprising a generator to produce refrigeration from a heat source coming from the residual energy of the combustion engine comprising at least partially the residual heat from the exhaust gases of the combustion engine and the residual heat of the cooling liquid of the cooling circuit of the combustion engine, - a heat exchanger arranged on the exhaust gas discharge line, - a coupling circuit configured to ensure the fluid connection of the cooling circuit to the heat exchanger, of the heat exchanger to the generator, of the generator to the cooling circuit so as to transfer to the generator, the residual heat from the cooling circuit and the residual heat from the exhaust gases, where it comprises: - an intermediate circuit configured to ensure the fluid connection of the heat exchanger to the generator and of the generator to the heat exchanger so as to transfer the residual heat from the exhaust gases to the generator without fluid connection to the cooling circuit, by decoupling the cooling circuit without fluid circulation between the intermediate circuit and the cooling circuit, - a heating circuit configured to ensure the fluid connection of the cooling circuit to the heat exchanger and of the heat exchanger to the cooling circuit advantageously without fluid connection to the generator, and - a circuit management module comprising valves (3, 4, 5, 6) configured to orient the cooling liquid according to the circuit to be used, characterised in that the circuit management module is configured to control the opening and the closing of the valves (3, 4, 5, 6), to ensure the circulation of the cooling liquid in the cooling circuit and in a decoupled manner in the intermediate circuit, when the temperature of the cooling liquid at the outlet of the combustion engine is less than a predefined threshold temperature. - an intermediate circuit configured to ensure the fluid connection of the heat exchanger to the generator and of the generator to the heat exchanger so as to transfer the residual heat from the exhaust gases to the generator without fluid connection to the cooling circuit, by decoupling the cooling circuit without fluid circulation between the intermediate circuit and the cooling circuit, - a heating circuit configured to ensure the fluid connection of the cooling circuit to the heat exchanger and of the heat exchanger to the cooling circuit advantageously without fluid connection to the generator, and - a circuit management module comprising valves (3, 4, 5, 6) configured to orient the cooling liquid according to the circuit to be used, characterised in that the circuit management module is configured to control the opening and the closing of the valves (3, 4, 5, 6), to ensure the circulation of the cooling liquid in the cooling circuit and in a decoupled manner in the intermediate circuit, when the temperature of the cooling liquid at the outlet of the combustion engine is less than a predefined threshold temperature.