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Originally Posted by 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.
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a) Still better than aluminum.
b) Not to accurate.
c) Because modern engines run significantly cooler by design not needing more costly radiators.