Knowledge of auto parts

How important are radiator covers to car cooling systems?

Radiator Cap

Modern forced circulation water cooling system of automobile engine is strictly covered with radiator cover on the radiator and coolant mouth, so that the water cooling system becomes a closed system, usually called the closed water cooling system.
It has two advantages:
(1) The closed water cooling system can increase the pressure in the system by 98~196kPa, and the boiling point of the coolant is correspondingly increased to about 120℃, thus enlarging the temperature difference between the radiator and the surrounding air and improving the heat transfer efficiency of the radiator. Due to the enhancement of the cooling capacity of the radiator, the size of the radiator can be reduced accordingly.
(2) Closed water cooling system can reduce coolant spillover and evaporation loss.

The Role Of The Radiator Cover

The function of the radiator cover is to seal the water cooling system and adjust the working pressure of the system. As the engine is operating, the temperature of the coolant increases gradually. The expansion of coolant volume increases the pressure in the cooling system. When the pressure exceeds the predetermined value, the pressure valve is opened and part of the coolant flows into the compensation bucket through the overflow pipe to prevent the coolant from expanding and cracking the radiator. When the engine stops, the temperature of the coolant drops and the pressure in the cooling system decreases. When the pressure falls below the atmospheric pressure, the vacuum valve is opened, and the coolant in the compensation bucket partially flows back to the radiator, which can avoid the radiator being damaged by the atmospheric pressure.



Proper Way To Open Radiator Cover

Try not to open the radiator cover when the engine is very hot, otherwise the high pressure engine coolant vapor escaping from the radiator can cause serious burns. If the engine is to be opened when it is hot, the following method should be used:
1. Cover the radiator cover completely with a damp cloth.
2. Hold down the heat sink cover and slowly turn the heat sink cover in the open direction until the coolant vapor escapes.
3. Fully open the radiator cover after releasing the coolant vapor pressure.

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