Abstract: An air-conditioning system of a motor vehicle, including: a primary, gas compression cooling circuit set entirely in the engine compartment; a secondary cooling circuit that takes cold from an evaporator or chiller of the primary circuit and conveys it to a heat exchanger in the passenger compartment; the system has elements for setting in fluid communication the primary circuit, the secondary circuit and a circuit for heating the passenger compartment. The heating circuit has a heat exchanger which is used as a heater when the heating system is activated, and can be used as additional mass for cooling air of the passenger compartment to meet the peak cooling requirement.

Abstract: An air-conditioning system of a motor vehicle, of the type comprising a primary cooling circuit, set entirely in the engine compartment, and a secondary cooling circuit that takes the cold from an evaporator or chiller of the primary circuit and conveys it to a heat exchanger set in the passenger compartment, is provided with means for setting in communication said secondary circuit with the heating circuit of the passenger compartment. In this way, the heat exchanger of the heating circuit, which is used as heater when the heating system is activated, can be used as additional mass for cooling the air of the passenger compartment to meet the peak requirement for cooling power in transient conditions, such as, for example, when a person prepares to get into the passenger compartment after the vehicle has been parked for some time in the sun, without this involving any oversizing of the air-conditioning system with respect to its prevalent conditions of use.