[ibmkg]

They do have some valid points.

a) Copper is not a copper rad but mix of copper and brass. Brass is in contact with water mostly.

b) Al 's heat dissipation is better than Cu. That seems good for a rad.

c) All new automobiles use Al rads. Al intercoolers (for turbo air cooling), AC coil/rad and engine rad all are Al now a days. There must be more to the fact that they are cheap since expensive newer cars have them.