A new radiator is a couple hundred bucks, but a junkyard might sell one as low as $30, so it can be worth a risk, if you inspect it carefully before buying AND test it while it's still in warranty (30 days usually).

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For more info, read this article that fully explains the cooling system, and this one that explains how to rebuild a plastic-tank radiator at home.

Owner caption September 2012 · Photo 4710 of 5000