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Engine coolant: what it is, what it is for and when to change it

Engine coolant, also known as coolant or radiator fluid, is an essential component for the proper functioning of a vehicle.

It plays a crucial role in maintaining the optimal temperature of the engine, preventing overheating, and ensuring the efficiency and longevity of the engine.

What is coolant?

Coolant is a mixture of demineralized water and chemical additives, such as ethylene glycol.

These additives have the function of raising the boiling point of water and lowering its freezing point, allowing the engine to operate in a safe temperature range regardless of weather conditions. You might like to read about zero car sales trends.

What is coolant used for?

The main function of coolant is to absorb the heat generated by the engine and dissipate it through the radiator.

This prevents the engine from reaching excessive temperatures, which could cause severe damage to the internal components.

In addition, the coolant protects the cooling system against corrosion, deposit formation and freezing in cold climates.

How does the cooling system work?

The cooling system consists of several components, including the radiator, water pump, thermostatic valve, and expander vessel.

Coolant circulates through these components, absorbing heat from the engine and releasing it into the radiator.

The thermostatic valve regulates the circulation of the liquid, ensuring that the engine reaches and maintains the ideal operating temperature. You might like to check out latest car launches.

When to change the coolant?

The coolant change should follow the vehicle manufacturer’s recommendations, which generally vary between 30,000 km and 60,000 km or every two years, whichever comes first.

It is important to regularly check the coolant level and condition, as lack of maintenance can lead to engine overheating and cooling system failures.

Signs that the coolant needs to be changed

• Changed color: The coolant should be a light and uniform color. If it’s cloudy or particulate, it’s time to change it
• Low level: Regularly check the level of fluid in the expander vessel. If it is below the recommended level, top up with the appropriate mixture
• Overheating: If the engine is overheating frequently, it could be a sign that the coolant is old or contaminated

How to change the coolant?

1. Turn off the engine: Make sure the engine is cool before starting the process.
2. Drain the system: Open the radiator drain valve and allow the old liquid to drain completely.
3. Flush the system: Fill the system with demineralized water and run the engine for a few minutes to clean up residue.
4. Add the new liquid: Mix the radiator additive with demineralized water in the recommended ratio and fill the system.
5. Check for leaks: After completing the system, check for leaks and adjust the liquid level as needed.

Keeping coolant in good condition is critical to engine health and vehicle efficiency. You might like to learn about vehicle battery maintenance.

Following the change recommendations and performing regular checks can prevent serious problems and ensure a longer life for the engine.