How to mix concentrated antifreeze with water

how to mix concentrated antifreeze with water

Often you will find that antifreeze comes pre-diluted. However, if you happen to purchase concentrate antifreeze, it is advisable to mix it with water first before pouring it into your car’s cooling system. So, how do you mix concentrated antifreeze with water?

Every once in awhile, your car’s engine will run hot and require a cooling system to maintain optimal operating temperatures. The cooling system of a vehicle aids in transferring heat away from its engine, allowing the car to function at average working temperatures.

Without a proper working cooling system, your car will soon overheat, leading to its eventual breakdown as various parts of the engine will overheat.

More so, coolant must operate in liquid form, while maintaining cold temperature without freezing. Antifreeze ensures your motor keeps running smoothly, even in the coldest of winters.

However, you must mix water and antifreeze in the appropriate quantities to ensure that the coolant performs its function correctly. Generally, warm parts of the country mix antifreeze with water in the ratio of 70:30, but most manufacturers recommend mixing them 50:50.

How does antifreeze work?

For us to thoroughly understand how much concentrated coolant we need in our car’s cooling system, we must first fully comprehend how antifreeze works. Antifreeze consists of ethylene glycol, which is combined with water in order to help cool your motor and resist freezing.

The most common ratios used are 70 percent water to 30 percent antifreeze for warmer parts of the country, but in colder areas, it is best to use a 50:50 ratio of antifreeze to water.

Antifreeze manufacturers also add various additives, often silicates and phosphates, to help prevent corrosion of engine parts, as well as to assist in maintaining its cool temperatures.

antifreeze its green color

These inorganic oxides give antifreeze its green color and also cause the wearing out of antifreeze as they promote the formation of a protective coating in the cooling system of a car. As such, it is necessary to keep checking the condition and level of antifreeze in your vehicle.

Why mix antifreeze with water?

Generally, water is a fantastic cooling fluid, but it can cause corrosion in the engine, as well as rusting to its internal components. On the other hand, antifreeze has a higher boiling point and a lower freezing point than water, which helps in protecting your engine in extreme weather conditions.

As such, it prevents the water from boiling when it gets too hot, which would otherwise make it ineffective in taking away heat from the engine of your vehicle.

When mixed with antifreeze, the properties of water shift as the temperature at which it boils increases, allowing it to withstand more heat.

As a result, the water’s ability to cool down the engine increases since it is an excellent conductor of heat. The solution formed retains more heat without changing into a gaseous state.

It is always advisable to mix antifreeze with water according to the manufacturer’s instructions. As such, make sure you read the label before proceeding with any mixing of liquids.

It is also vital to note that antifreeze is toxic to animals and enticing to cats and dogs due to its sweet taste. However, they should not drink it as it is usually quite deadly.

Exercise care when opening and dumping your antifreeze as it is harmful to both animals and plants. It is best to dispose of it in a watertight container and take it for recycling.

How do you refill your radiator with diluted antifreeze?

Before you begin to mix your concentrated antifreeze and water, you should first consult your car’s manual. There is a section dedicated to coolant or antifreeze-usage specifications. Similarly, it is always a good idea to keep a clean empty container around as it may come in handy during the mixing of antifreeze and water.

It is also useful to note that tap water has several minerals, such as calcium, magnesium, and traces of iron, which can deposit themselves in your cooling system, causing damage.

Therefore, use demineralized or soft water as it will not destroy the internal components of your car. You should also ensure that both the engine and coolant systems of your car are completely cool before starting.

After draining your car’s coolant system and combining the proper mixture of water and antifreeze, put the mixture in your car’s coolant system, and you are ready to go.


It is vital that you make sure your vehicle has the proper concentration of water to antifreeze in its coolant system. The appropriate mixture of antifreeze and water ascertains that your vehicle is running correctly and protects the radiator and engine from rusting and corrosion.

If you require assistance with filling your coolant and determining its condition, call your trusted mechanic to top off your coolant appropriately and help you determine your best course of action.


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