Radiator cap and radiator check

The cooling system is under pressure. The radiator cap has a built-in spring that is sized so that the cap gasket closes the cooling circuit and opens it if the pressure inside the cooling system rises to 1.4-1.8 bar [140-180 kPa]. The pressure inside the cooling system rises due to the expansion of the coolant, which leads to an increase in the boiling point.

The radiator pump is used to check the radiator cap. The procedure for carrying out the work is similar to that described for a gasoline engine. The radiator pump can be used to check the cooling system for coolant leaks.