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Originally Posted by HammerSandwich
That's the main reason for aluminum rads.
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I thought it was mainly to prevent corrosion, since a lot of engine components use aluminium too now (actual engine block excluded, steel), but the cost factor is definitely a big one.
I've replaced the aluminium radiator on my car, and it was scary to see something that is as large as one would expect, but only 3/4" thick. My car struggles to keep cool, in this hot Texas weather: now I know why!