System and method for identifying a fluid circuit System for filling and testing (100) and adapter for filling (1) the fluidic circuit (2), in particular for engine cooling, by at least one filling fluid comprising an acoustic identification system (3) of the fluidic circuit ( 2) to be completed. The acoustic identification system (3) comprises an acoustic impedance sensor (30) able to measure the input impedance (Z), a waveguide, a source (32) coupled to the waveguide ( 31) and a processing module (34) capable of recording the acoustic signature returned by the fluid circuit (2). The acoustic signatures make it possible to determine which fluidic circuit (2) is linked to the adapter (1) to validate or modify the fluidic circuit filling instructions (2). Figure for the abstract: Figure 3
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