Expansion tank of the cooling system
The cooling system is filled year-round with a mixture of water, antifreeze and anti-corrosion agent. This prevents rust and corrosion, salt deposits and, in addition, increases the boiling point of the coolant. Excessive pressure is created in the cooling system due to the expansion of the liquid during heating, which also leads to an increase in the boiling point of the coolant. The pressure is limited by a valve located in the cover of the expansion tank, which opens at a pressure of 1.4–1.6 atm. The engine cooling system requires an elevated boiling point for the coolant to function properly. At low evaporating temperatures, vapor lock may form, resulting in reduced fluid circulation and poor engine cooling. Therefore, the cooling system must be filled with a mixture of water and the listed additives to it all year round.