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Tig Weld

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If you use an aluminum radiator, make sure it features a fully-welded construction. The least expensive radiators have sidetanks attached to the cores with epoxy. These have a short life-expectancy; especially in a harsh off-road environment with vibration and heavy shock loads. Flex-a-lite, Griffin, U.S. Radiator, and some other aluminum radiators are fully welded.