Signs of needing to change car coolant? Which type is good?

On long trips or in hot weather conditions, maintaining a stable operating temperature for the car engine is extremely important. This is why the automobile cooling system was developed and coolant became a core component in the car’s operation.

So how often do you need to change coolant? What is the good coolant on the market today? Let’s learn about the article below with CarOn!

What is car coolant?

What is car coolant?

Car coolant is the liquid used to cool the engine in a car’s cooling system. It is a mixture of water and additives that prevent corrosion, antifreeze and enhance cooling efficiency.

The role of car coolant

Coolant plays an important role in regulating the temperature of a car engine. As the engine operates, the temperature increases and needs to be adjusted to ensure ideal operating temperature and avoid overheating. The cooling system uses coolant to absorb heat from the engine and conduct a cooling process, helping to maintain a temperature within a safe range for engine operation.

In addition to cooling, coolant also has an antifreeze function in cold weather conditions, ensuring the system does not freeze and fail in winter.

Operating principle of cooling water

The operating principle of car coolant is based on the principle of heat exchange. When the engine operates, the temperature in the engine increases due to fuel combustion. Coolant is pumped from the tank through cooling channels in the engine to absorb heat from hot components. Heat is absorbed by the cooling water, causing the water to increase in temperature and convert into steam.

The coolant is then pumped through the radiator, usually one made of aluminum or copper, located at the front of the vehicle. The radiator has many small tubes containing coolant, helping to increase the area exposed to air. When the car moves, the wind passes through the radiator and comes into contact with the coolant pipe, causing heat exchange and water cooling.

As fresh coolant passes through the radiator, the temperature drops and water is pumped back into the engine to continue the cooling process. This process repeats continuously during car operation to maintain a safe and stable operating temperature for the engine.

The importance of coolant in cars

Protects the engine from overheating

Coolant helps control the operating temperature of a car engine. When the engine operates, the temperature increases due to fuel combustion. If engine temperature exceeds safe levels, it can cause damage and shorten the life of important parts such as cylinders, piston heads and valves. Coolant absorbs heat from the engine and cools it to a safe level.

Ensures optimal cooling performance

The ideal operating temperature of a car engine is between 90°C and 104°C. Coolant plays an important role in maintaining this temperature. When the temperature is too low, the engine operates inefficiently and fuel consumption increases. On the contrary, too high a temperature can cause damage and reduce performance. Coolant ensures stable operating temperature and efficient engine operation.

Increases engine life and durability

High temperatures can cause damage to car engine parts. Coolant helps cool these parts and prevents breakdown and wear. Maintaining a stable operating temperature with coolant will increase the life and durability of the engine.

Reduce fuel consumption

An engine working at a stable temperature will consume fuel more efficiently. Coolant helps maintain ideal operating temperatures, reduces fuel consumption and keeps the vehicle running economically.

How often should you change car coolant?

Car coolant change time may vary depending on factors such as vehicle make, engine type, operating conditions and coolant quality. However, according to the recommendations of car manufacturers, you should clean the coolant and change the car’s coolant after 40,000-60,000 Km operate or after 2-3 years. In case of weather conditions or high travel frequency, you should replace them sooner to ensure their good performance.

Signs of needing to change car coolant

Engine temperature increases

If you notice that the engine temperature is higher than normal, this may indicate that the cooling system is not working effectively. The coolant may be depleted or contaminated, making it difficult to maintain a stable engine temperature. In this case, the coolant should be checked and replaced if necessary.

Coolant color changes

If you see the coolant color changes from the original color. Cloudy, rusty or unusual colors may indicate that the coolant is contaminated or that the anti-corrosion additive has expired. In this case, it is necessary to change the coolant and clean the system.

Bad smell from the cooling water system

If you feel an unpleasant odor from the cooling system when opening the car door, this may indicate that the coolant is contaminated or the additives are no longer effective. Changing the coolant and cleaning the system is necessary to remove odors and maintain vehicle freshness.

Distinguish car coolant by color

  • Green Coolant: This is the traditional and most popular type of coolant. Blue coolant often contains ethylene glycol as an antifreeze and anti-corrosion additive. This type of water is suitable for most types of engines
  • Red Coolant: Red coolant is usually based on ethylene glycol or propylene glycol combined with anti-corrosion additives and antifreeze. This type is often used for high-end vehicles. level and have special requirements.
  • Yellow coolant: Yellow coolant often contains propylene glycol as an antifreeze and anti-corrosion additive. This type of water is commonly used for plastic and rubber cooling systems, but may also be suitable for other types of engines.
  • Gray coolant: Gray coolant often contains anti-corrosion additives and other additional additives. This type of water is often used for special cooling systems or in some special industrial applications.

What kind of car coolant is good?

Currently on the market there are many types of coolant for cars with many different brands, some of which are commonly used and highly appreciated include:

Liqui moly engine coolant

Liqui moly engine coolant

This is a product imported from Germany, suitable for aluminum engines operating at high power, does not contain amines, nitrites, phosphates or silicates and is suitable for all vehicle models.

Prestone coolant

Prestone coolant

Prestone is a car coolant product from the US. The product is manufactured to target the tropical countries market with the best price for consumers.

Focar coolant

FOCAR Red Coolant incorporates organic carboxylate (OAT) corrosion inhibitors that are more stable and retain better in solution than traditional coolants, and allow for long-term use. Moreover, it does not cause scale build-up, fouling, or wear on related systems.

Focar coolant

Thaco coolant

This is a brand produced by the Vietnamese company Thaco, with a reasonable price, diluted and can be used immediately.

Cause of rapid loss of cooling water


Leaks in the cooling system are a major cause of coolant loss. Leaks can occur in parts such as water pipes, needle heads, coolant tanks or any other part of the system. When there is a leak, coolant will escape and lead to significant loss.

Coolant is leaking

Part damage

Cooling system components, such as the water pump, thermostat valve, cooling fan or tank, may be damaged. When these parts do not function properly, coolant is not circulated effectively, leading to rapid water loss.


A small amount of coolant may evaporate through the cooling system during engine operation. However, if evaporation is too rapid, this can cause significant water loss. The cause of evaporation may be high pressure, too high temperature or the system has not been handled correctly.

Large water consumption

Some motor vehicles have a greater need for coolant consumption than other vehicles. This may be due to the special design of the engine or the specific operating requirements of the vehicle. When this happens, coolant is consumed quickly and needs to be replaced regularly.

Reputable address for replacing car coolant?


CarOn Pro – 5S standard car service system

Caron Pro is trusted and known by customers as a chain of 5S standard auto repair service centers. With extremely modern equipment, genuine spare parts, skilled technicians, a full range of services at extremely affordable prices and quality. With a variety of services and products, CarOn is committed to providing the most dedicated quality and service.

Please contact us immediately via Hotline: 0961.247.360

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