Car expansion fluid is coolant

The car expansion tank is filled with coolant. Coolant, the full name should be called antifreeze coolant, which means coolant with antifreeze function. Antifreeze can prevent the coolant from freezing and cracking the radiator and freezing the engine cylinder when parking in cold seasons. Antifreeze is not only used in winter. Yes, it should be used year-round.

The function of the expansion tank: The coolant flows in the engine cooling circuit, and as the temperature increases, the volume expands and the pressure increases. An expansion tank is installed to absorb this expansion volume and reduce the pressure of the cooling system. The volume of the expansion tank is generally 4% to 6% of the total volume of the entire cycle.

Expansion tank classification: Cooling systems with expansion tanks are divided into two types according to whether the expansion tank is pressurized or not: Expansion tank: There is an expansion space (expansion tank) for coolant in the pressurized closed system, cooling The liquid is circulated into the expansion space to separate the gas and liquid and release the system pressure. The expansion tank should be heat-resistant and pressure-resistant, positioned higher than the radiator and maintain appropriate pressure in the system.

Overflow pot: There is an expansion space (overflow pot) for the coolant in the pressurized open system. The system pressure is released through the pressure valve on the radiator cover, allowing part of the coolant to overflow into the overflow pot. , perform gas-liquid separation, and the overflow kettle has lower heat resistance, capacity, and location requirements