radiation
conduction
convection
radiation and conduction
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I stiffness disagree with you oga,itself is cooled by radiation but cool the engine by convention

Abstract: Most internal combustion engines are fluid cooled using either air (a gaseous fluid) or a liquid coolant run through a heat exchanger (radiator) cooled by air.

it is radiation not convection but if you think otherwise drop ur explanation and let see....

The radiator of a motor car is cooled by convection.
The radiator is a heat exchanger that is used to transfer the heat generated by the engine to the surrounding air. The hot coolant(liquid) from the engine flows through the radiator, and as it passes through the radiator, it is cooled by the air that is flowing through the radiator.

Radiator cools the engine of vehicles by convection.. Radiator is blackened so to cool itself by radiation ..the answer is A


