Can I Put Concentrated Coolant in My Car? (Know It Now!)

concentrate coolant in car

Coolant should always be mixed with water according to the manufacturer’s recommendations.

Can I Put Concentrated Coolant in My Car?

You can put concentrated coolant in your car but Ethylene Glycol, the active element in the coolant, doesn’t absorb heat at a higher rate than water. When pure coolant is used in a car’s cooling system, the system loses about 35% of its heat-transfer capabilities compared to when coolant is mixed with the appropriate amount of water.

Running your engine on pure coolant is a fool’s errand that will only hasten its doom.

Similarly, overheating and damage from improper concentrations of the combined heating and cooling components can be produced by the use of concentrates that do not flow evenly and a lack of combination, putting components under stress for an extended period.

If you use the right combination, the goods should stay smooth thereafter.

What Happens if I Put Concentrated Coolant In Car?


  • Corrosion inhibitors in coolants provide resistance to corrosion of dissimilar metals.
  • Freeze-proofing. The major constituent in the coolant, Ethylene Glycol, has a freezing point of around (-) 30 degrees Fahrenheit, depending on concentration.
  • High-temperature resistance. A pressurised cooling system (15 psi) can often withstand temperatures of up to 130 degrees Fahrenheit or higher in the surrounding air.
  • Some coolants contain conditioners that lubricate and increase the life of the water pump seals.


There are three reasons why pure coolant (ethylene glycol) should not be used in a car’s cooling system at full strength.

1. Pure ethylene glycol freezes between 0 and minus 5 degrees Fahrenheit, which is the primary and possibly most crucial reason.

The freezing point of the pure coolant is only decreased when it is combined with water.

If you require protection below 0 degrees Fahrenheit, you should combine the coolant with water in the quantities recommended by the automobile or coolant manufacturer.

2. The second factor is the polar opposite of the first. A combination of coolant and water has better heat-transfer properties than pure coolant.

In reality, when pure coolant is used in a car’s cooling system, the system loses around 35% of its heat-transfer capabilities compared to when coolant is blended with the appropriate quantity of water.

This may not seem vital in the winter, but it is critical in the summer, especially in our cars with power accessories, when engine temps may rise.

The cooling fluid must be able to absorb heat and transport it away from the engine as quickly as possible.

Coolant alone isn’t nearly as effective as coolant combined with water at removing heat from the engine.

3. The performance additives (silicates, phosphates, and nitrates) must be suspended in water, which must be blended with the coolant. These vital ingredients tend to settle in the absence of water. You’ll lose anti-corrosion and other additional protection if they do that.

That’s why it’s a good idea to flip over the bottle of fresh coolant and shake it a few times before adding it to the cooling system, even if it’s not indicated on the container. The extra shake ensures that the additives are thoroughly suspended and haven’t settled to the bottom of the container.

How to Put Concentrated Coolant in a Car?

  • Half of a gallon of coolant should be poured into an empty, clean one-gallon container.
  • Fill each of the gallon containers with distilled water, which are already half-filled with coolant. A 50/50 combination of water and coolant should now be in each container.
  • In colder areas, use a larger proportion of coolant in the water/coolant combination to defend against extremely low temperatures. Fill the one-gallon container with up to 70% coolant and 30% distilled water.

Coolant is frequently sold pre-diluted. However, before using concentrated coolant in a cooling system, dilute it with water first. The correct amount of water is added to offer the necessary protection from freezing and boiling over. Tap water has high quantities of calcium and magnesium, which can cause scaling and corrosion.

Even if you are not going to use the coolant right away, you may dilute and prepare it ahead of time and store it until you are ready to use it.

What can I mix with concentrate coolant to dilute it?


You should fill your radiator with the best water you have on hand. This should ideally be distilled water. You may also use tap or bottled water. Keep in mind that tap or bore water includes minerals that might leave deposits in your cooling system, causing corrosion and shortening the radiator’s lifespan.

Can You Add Water to the Concentrated Coolant?

Water is a good diluent for concentrated coolants. Water directly from the tap, on the other hand, is not recommended since it includes minerals that might reduce the efficiency of the coolant. When it comes to contaminating the coolant, distilled water is the finest option.

For warmer regions of the nation, the most typical ratio is 70% water to 30% coolant, however, in colder places, a 50:50 coolant to water ratio is recommended.

Water’s Advantages and Disadvantages To Use With Coolant

Using water in your radiator system introduces pollutants. Water is far healthier for the engine than driving with low coolant, but you should replace the water as quickly as possible with a suitable coolant for your car.

When you add water to a radiator, whatever coolant that may still be present is diluted. Coolant serves numerous purposes, including corrosion prevention, raising the boiling point of water, and reducing the freezing point of water. While water can be used in place of coolant for a limited period, it will not adequately preserve your engine.

This indicates that the issue that produced the low coolant level must be resolved as quickly as possible, and the radiator must be filled with a 50/50 mix of coolant and water.

What Happens If Water Gets in the Coolant?

When coolant is added to water, the characteristics of water change. It begins to boil at a higher temperature. This boosts its capacity to endure heat and, as a result, its ability to cool down everything it comes into touch with.

Water is a good conductor of energy, therefore it absorbs a lot of it. When you add coolant to the mix, the boiling point rises, making it even better at conducting.

In other words, the fluid solution may hold on to more heat before converting to a gaseous form. In layman’s terms, coolant-containing solutions are better at cooling down heated engine parts as they run through your engine blocks.

Coolant also acts as a carrier for a variety of additives that help to decrease the corrosive effects of the solution. These additives may include sodium silicate (an aluminium anticorrosive) and antifoaming agents, among others.

Always check the manufacturer’s instructions to learn how and if coolant and water should be mixed.

It’s also worth noting that coolant is extremely hazardous to animals. It appeals to dogs and cats because it has a pleasant flavour. If given the opportunity, they will try to drink it, and it is typically fatal.

How Much Water Do You Add to Concentrated Coolant

  • In milder temperatures, for example, a 30:70 combination (30% coolant, 70% water) can be effective.
  • In locations where the temperature often drops below 0°C, however, a larger quantity of coolant is necessary for the coolant. Mixtures with a 50:50 ratio work in practically all climates.
  • Mixtures of 60% coolant and 40% water are more suited to protect coolant from freezing in locations where temperatures drop below 0°C for extended periods.

50/50 Coolant

The 50/50 coolant is a concentration that has been blended 1:1 with water.

Can I Mix 50/50 Coolant with Concentrate?

You can mix 50/50 coolant with concentrate.

Keep things simple and follow the manufacturer’s recommendations unless you’re an expert on the particular chemical makeup and reactions of the many sorts. Damage to the radiator and cooling system (which might lead to engine/water pump damage) and a large repair bill could result from mixing the wrong kinds. Always refer to the owner’s handbook for information.

Concentrated Coolant vs 50/50 Coolant

Your engine’s optimal coolant mixture is around 49%. The concentrated coolant has a concentration of 98%. So, if you’re going to get a concentrated coolant, you’ll need to figure out how much you’ll need.

You’ll also need to combine equal parts of distilled water and concentrate. You won’t have to mix anything if you obtain a pre-diluted 50/50. You are also not required to purchase anything else.

Use bottled water instead of tap water. Chlorine and minerals in tap water cause scale buildup in your engine.

If you live in a hot location, you can go as low as 36%. However, the anti-corrosion compounds will be diluted. For warmer conditions, some people will use a pre-diluted 36/63 blend.

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