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The aim of the present paper was to discuss, on the basis of electrochemical results and microscope observations, the representativeness of the Nissan OY water test (acidic solution containing chloride) used to evaluate the internal corrosion resistance of heat exchangers from the cooling loop. The corrosion behavior of brazed aluminum alloys (AA4343/AA3003*/ AA4343) was investigated in neutral and acidic solutions with and without chloride by electrochemical measurements. For the three layers present in the brazed material, i.e. the residual cladding, the band of dense precipitates (BDP) and the core material unspoiled by silicon diffusion, the polarization curves were obtained in the different media. It was observed that the core material presented good corrosion resistance in neutral solutions.