Igwe mmiri nke radiator bụ eriri rọba nke na-ebufe coolant site na mgbapụta mmiri nke injin gaa na radiator ya. Enwere ụdọ radiator abụọ na injin ọ bụla: eriri ntinye, nke na-ebufe igwe oyi na-ekpo ọkụ na injin ahụ wee bufee ya na radiator, yana ọzọ. bụ eriri ntinye, nke na-ebufe igwe oyi na-ekpo ọkụ site na radiator gaa na engine. Ọnụ, ụdọ na-ekesa coolant n'etiti engine, radiator na mgbapụta mmiri. Ha dị mkpa maka idowe ọnọdụ okpomọkụ kacha mma nke injin ụgbọ ala.