The **coolant** has the primary mission of **cooling the vehicle's engine**. This system is essential to keep the engine at an appropriate temperature, preventing it from overheating and its parts from wearing out or breaking due to excessive heat.

- The coolant circulates through the engine parts, absorbing the heat generated during its operation. Then, this liquid is directed to the **radiator**, where it is cooled before returning to the engine, driven by a **water pump**.

- It is important to ensure that the coolant level is between the minimum and maximum marks when the engine is cold, to guarantee its correct operation.

- Additionally, the cooling system must be in good condition, especially at the beginning of winter, to prevent the liquid from freezing and causing damage to the engine or the cooling system.

Therefore, the main function of the coolant is to keep the engine cool and in good condition, ensuring its correct operation and prolonging its useful life.