<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> Radiators are heat exchangers used to transfer thermal energy from one medium to another for the purpose of cooling and heating . The majority of radiators are constructed to function in automobiles, buildings, and electronics . The radiator is always a source of heat to its environment, although this may be for either the purpose of heating this environment, or for cooling the fluid or coolant supplied to it, as for engine cooling . Despite the name, most radiators transfer the bulk of their heat via convection instead of thermal radiation . Spacecraft radiators necessarily must use radiation only to reject heat . </P>

Which type of heat exchanger an automobile radiator is