In the liquid cooling system of an engine, between which components does the pump circulate the coolant?

Question

DentroTest · Accepted Answer

The cooling pump, or water pump, is the element that forces the coolant to circulate through the closed circuit. It draws the hot coolant from the water jackets surrounding the cylinders in the block and the cylinder head and pushes it toward the radiator, where it dissipates the heat to the outside through the airflow, and returns it cooled to the engine. Saying that it circulates it between the radiator and the sump is wrong, because the sump houses and collects the lubricating oil, which is a separate circuit. Nor does it circulate it between the radiator and the expansion tank: the latter only absorbs the changes in volume and pressure caused by the expansion of the fluid, and the pump does not push the main flow of heat exchange toward it.

In the liquid cooling system of an engine, between which components does the pump circulate the coolant?

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