I need to know if my Radiator in my 1991 300 se is Copper, Aluminum, or what. on 1991 Mercedes-Benz 300SE

I need to know if my Radiator is Copper, Aluminum, or what?

Asked by for the 1991 Mercedes-Benz 300SE
Commonly, copper radiators are all metal and black in color. Aluminum radiators have plastic "side tanks" and the center core is unpainted aluminum.
Thank you for the info. Mine has plastic sides and metal middle but has a plastic overflow tank on the side where you put the Radiator Fluid not like a normal Radiator where you put the fluid right in the Radiator not in a resivour.