METHOD OF MAKING EXPANSION TANKS FOR COOLING SYSTEMS AND/OR ENGINES

A manufacturing process for making different expansion tanks for different cooling systems and/or for different engines, each of said expansion tanks having an inlet mouth and comprising: a plastic shell comprising a) a wall defining a cavity for containing a coolant liquid; and b) at least one collar at said inlet mouth, said collar being outwardly projecting from said wall. Each of said expansion tanks further comprising a tubular insert engaging said collar and defining said inlet mouth; said tubular insert being made of plastic material colored in mass; and retention means which hold said tubular insert relative to said collar. The process comprising making shells identical in shape and size, for all of said expansion tanks; and making inserts that differ in the value of their inner diameter; each inner diameter value being determined at the design stage depending on the type of cooling system and/or the type of engine.