Procedure for controlling the charging of refrigerant in an air conditioning system in a vehicle

The method of controlling the refrigerant fluid feed to a motor vehicle air conditioning circuit involves using a refrigerating power of the radiator from a temperature sensor placed in contact with the radiator or downstream of it in the cooled air flow. The method involves comparing the level (C) of the signal to the reference level (B) corresponding to a normal fluid charge, a lower level indicating and under charge.