Car radiators are typically not painted matt black. They are usually made of materials that are resistant to corrosion and can withstand high temperatures, such as aluminum, copper, or brass. These materials are often left unpainted or may have a protective coating that is not matt black.
Matt black paint can absorb and retain heat, which can be detrimental to the performance of the radiator. A radiator's primary function is to dissipate heat away from the engine, so painting it matt black could reduce its efficiency.
