The cooling system of a liquid-cooled automobile circulates liquid through the pipes and passages in the engine. When liquid flows through a high-temperature engine, it absorbs heat, thereby reducing the temperature of the engine. After the liquid flows through the engine, it flows to the heat exchanger (or radiator), and the heat in the liquid is dissipated into the air through the heat exchanger.
Some early cars used air-cooling technology, but modern cars hardly use this method. This cooling method is not to circulate liquid in the engine, but to dissipate heat from the cylinder through aluminum fins attached to the surface of the engine block. A powerful fan blows on these aluminum sheets to dissipate heat to the air, thereby cooling the engine. Because most cars use liquid cooling, this article will focus on the liquid cooling system. There are a lot of pipes in the cooling system in a car. We start with the pump and examine the entire system one by one. In the next section, we will describe the various components of the system in detail. After the pump delivers the liquid to the engine block, the liquid starts to flow in the engine passages around the cylinder.