Why are modern radiators made from aluminium with plastic ends? What is the durability compared to 100% aliuminium radiators?
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With the improvements in modern antifreeze I rarely see radiator failures. Not that they don't happen, just no where near as often they did years ago. I think the crimped seal is more resistant to fatigue failure then the older brazed tanks were. Since aluminum can be expensive to shape and weld I am sure the reason for the change was a cost savings issue. Plastic is cheaper and easier to form than brass or copper or aluminum. The crimp is done by a machine that most likely is cheaper and faster than a robotic welder or a skilled craftsmen doing it by hand. Most of the failures I see now are either impact damage or the cooling fins separating from the tubes.
Aluminum radiators are more expensive to make. They are a hint more durable, but the increased cost is rarely worth the increase in weight and very small increase in durability.