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Heat exchangers, heat sinks potato potado.
Copper prices skyrocketed when the demand exceeded availability. Construction demands, building requirements and the closing of two major copper mines.
One reason added to dropping copper rads, was losing, grams, ounces, lbs wherever they could, less weight means less energy required to move. Meaning getting to those MPG regulations.
Like any problem to be solved, some good engineering to overcome the Cu to Al thermal conductivity.