General description of the cooling system (Hyundai Elantra J1)

All vehicles are equipped with a cooling system with circulation of coolant under thermostatic control. A water pump, mounted on the front of the engine, pumps coolant through the engine. Coolant flows around each cylinder toward the rear of the engine. Cast coolant passages direct coolant around the intake and exhaust ports behind the spark plugs and in close proximity to the exhaust valve guides.

The thermostat is located at the rear of the engine. During warm-up, the closed thermostat prevents liquid from passing through the radiator. As the engine reaches normal operating temperature, the thermostat opens and allows hot coolant to flow into the radiator where it is cooled before returning to the engine.
In the cooling system at operating temperature there is excess pressure of 1.2-1.5 bar, which significantly increases the boiling point of the coolant above 100°C. At the same time, a certain reserve is provided. The engine can reach temperatures above 100°C without the risk of boiling the coolant in the cooling system. To maintain the correct pressure in the system, the radiator is equipped with a cap with a safety valve (1.2-1.5 bar) and vacuum valve (0.03-0.1 3 bar). The vacuum valve allows air to enter as the coolant decreases in volume as it cools.



(The original material is located on the website: «www.hyundaibook.ru»)