
Originally Posted by
niky
Nothing much, really.
Manufacturers choose radiator materials based on the needs for lightness or cost. Most specify plastic and aluminum for new radiators.
Old-school radiator shops prefer radiators with brass or steel end tanks because they don't have the equipment to weld aluminum and plastic can't be welded. But most modern cars go at least 100,000 to 150,000 kilometers before needing any cooling system replacement parts (mostly hoses), and replacements are usually cheap. Then there are those more modern shops that can fabricate brand new radiators for you in any size or shape you want.