Radiator: Finned aluminium panel placed in the frontal part, inside of the engine bay.
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Inside of it flows the hot refrigerant. Its purpose is to allow the air at room temperature between the fins to cool the refrigerant. It has 2 thick hoses, one in the opening (upper part) and another in the exit (lower part).
Overheating i changed the engine i removed the thermostat radiator is clean the water level is the same… still only the water pump and the mecanicien said the water pump is working properly (altima 2009 mileage 210K)