System comprising - an exhaust gas line of a vehicle internal combustion engine and - an air conditioning device comprising an absorption machine for refrigeration comprising an absorber, a generator, a condenser, an evaporator and a fluid conveying circuit capable of receiving a working solution comprising a refrigerant fluid and an absorbent, the fluid conveying circuit connecting the generator to the condenser, the condenser to the evaporator, the evaporator to the absorber and the absorber to the generator, wherein ∘ the generator is configured to vaporise the refrigerant fluid of the working solution by heat transfer from a heat source comprising the waste heat of exhaust gases of the internal combustion engine intended to flow in the exhaust gas line, ∘ the condenser is configured to condense the vaporous refrigerant fluid from the generator, ∘ the evaporator is configured to vaporise the refrigerant fluid from the condenser by heat transfer from a secondary heat source and produce cooling energy, ∘ the absorber is configured to condense the vaporous refrigerant fluid from the evaporator to allow it to be absorbed by the working solution, characterised in that it comprises at least one refrigerant fluid storage module in fluid connection with the fluid conveying circuit of the absorption machine and a regulation module of the storage module configured to ensure at least partial bypass of the refrigerant fluid from the fluid conveying circuit to the storage module and conversely from the storage module to the fluid conveying circuit such that a target cooling energy is produced by the evaporator. - an exhaust gas line of a vehicle internal combustion engine and - an air conditioning device comprising an absorption machine for refrigeration comprising an absorber, a generator, a condenser, an evaporator and a fluid conveying circuit capable of receiving a working solution comprising a refrigerant fluid and an absorbent, the fluid conveying circuit connecting the generator to the condenser, the condenser to the evaporator, the evaporator to the absorber and the absorber to the generator, wherein ∘ the generator is configured to vaporise the refrigerant fluid of the working solution by heat transfer from a heat source comprising the waste heat of exhaust gases of the internal combustion engine intended to flow in the exhaust gas line, ∘ the condenser is configured to condense the vaporous refrigerant fluid from the generator, ∘ the evaporator is configured to vaporise the refrigerant fluid from the condenser by heat transfer from a secondary heat source and produce cooling energy, ∘ the absorber is configured to condense the vaporous refrigerant fluid from the evaporator to allow it to be absorbed by the working solution, ∘ the generator is configured to vaporise the refrigerant fluid of the working solution by heat transfer from a heat source comprising the waste heat of exhaust gases of the internal combustion engine intended to flow in the exhaust gas line, ∘ the condenser is configured to condense the vaporous refrigerant fluid from the generator, ∘ the evaporator is configured to vaporise the refrigerant fluid from the condenser by heat transfer from a secondary heat source and produce cooling energy, ∘ the absorber is configured to condense the vaporous refrigerant fluid from the evaporator to allow it to be absorbed by the working solution,