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Environment and A/C loop conditions strongly affect automotive evaporator performance. The aim of the activity is to identify the parameters it depends on and its functional dependence. Several evaporators, differing in size and technology, are tested on a bench, simulating a wide range of working conditions. The evaporator efficiency is introduced in order to correctly evaluate performances. The functional dependences from air velocity and humidity (key parameters) are shown, and a methodology to characterise automotive evaporators is proposed.