Abstract: A sectional radiator seal arrangement including a sectional radiator having a core and a bonnet, a nozzle defined by a cylindrical sidewall extending from and in fluid communication with the bonnet and the core, the nozzle configured for creating a seal with a radiator tank and a sleeve formed from a corrosion resistant material fitted about a portion of the cylindrical sidewall of the nozzle. A retaining compound can be provided between the sleeve and the radiator tank for preventing an ingress of coolant at the seal and into contact with either the nozzle or the bonnet. A method of reducing corrosion of the radiator seal also is provided.