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).
Coolant in radiator is getting blown out of the radiator into the overflow bottle which leaves the radiator less about a litre which then overheats the system