What does it mean to check coolant and refer to the user manual?

[KylieDella]

It indicates that the vehicle's antifreeze is insufficient and needs immediate replacement or replenishment. It could also be caused by excessively high radiator temperature. Main functions of coolant: To promptly dissipate the heat generated during engine operation. Therefore, good thermal conductivity is a basic requirement for coolant. Generally, the replacement cycle for coolant is about 4 years, but regular checks should be performed during use. These checks should be conducted when the engine is at normal temperature for both accuracy and safety. Functions of antifreeze: Corrosion prevention - The acidic byproducts formed from the decomposition of glycol compounds in coolant, along with acidic exhaust gases from fuel combustion that may permeate the cooling system, can accelerate corrosion. Scale prevention - To minimize scale formation, both production and filling of coolant require the use of softened deionized water. Freeze protection - Engine coolants contain additives that lower the freezing point of water to prevent the cooling system from freezing in cold weather. Heat dissipation - Antifreeze provides efficient heat transfer, carrying away excess engine heat to maintain optimal temperatures for critical metal components.