Air conditioning system of a motor vehicle passenger compartment and method for diagnosing a malfunction of such an air conditioning system

Abstract

The invention relates to an air conditioning system (2) for the passenger compartment (3) of a motor vehicle. The air conditioning system (2) comprises a refrigerant circuit (21) fluidically coupled to an inlet (E) and an outlet (S) of an air conditioning compressor (23). A first pressure sensor (22A) measures an upstream pressure (P1) at the inlet (E) of the air conditioning compressor (23), and a second pressure sensor (22B) measures a downstream pressure (P2) at the outlet (S) of the air conditioning compressor (23). A control unit (24) for the air conditioning system (2) uses the pressure measurements to identify several types of failures in the air conditioning system (2) by comparing them to different reference values ​​representative of said failures. Figure to be published with the abbreviation: Fig. 1