A radiator is a type of heat exchanger. It is designed to transfer heat from the hot coolant that flows through it to the air blown through it by the fan. The following schematic shows Honda Civic Hatchback (2002 – 2003) model years Fan and Radiator Parts Diagram. The Fan and radiator composed of radiator, radiator cap, O-ring, radiator fan switch, radiator fan assembly, upper radiator hose, drain plug, fan motor connectors, radiator fan connector, reserve tank, lower radiator hose, and A/C condenser fan assembly. (click image to enlarge).