Can You Mix Green and Orange Antifreeze | Green vs Orange Coolant

A Coolant or antifreeze liquid plays a significant role in preventing the engine of your car from overheating and also in maintaining its temperature and thus saves your car from damage as overheating or freezing can be a serious issue. Before, going toward green vs orange coolant just understand the basic concept about coolant and why we need that?

Coolants also come in different colors, green and orange coolants are in most common use nowadays and it is very confusing for the people to decide which one to use.

We are up with this article to give you a proper understanding of these two coolants so that you will not get confused next time about which coolant you should use.

So basically all the coolants whichever may be their colors perform the same tasks that are 

  • Preventing the engine from both overheating and freezing.
  • Prevent the engine from damage.
  • Maintaining the temperature of the engine.
  • Preventing the engine from corrosion.

The purpose of both green and orange coolants is also the same but they differ in some properties which you can read below.


Green and orange coolants use different technologies, and this is what makes these two different from each other. All the other factors that make a difference between them also rely on this point.

Green Coolant

The green coolants use inorganic additive technology commonly known as IAT which means these coolants do not contain any carbon components and consists of inorganic components only, this technology is for the cars whose manufacturing date is before 2000 as their components of the cooling system are made of copper and steel, and this inorganic additive technology coolants can prevent the cooling system of the cars made of copper and steel from corroding.

Orange Coolant

Previously the cooling systems of cars were made from steel and copper but after 1990 manufactures start making them more of aluminum and nylon and this marks the emergence of orange coolants which focuses more on preventing these new components, the orange coolants use organic technology, which indicates that they consist of carbon as their component. So these types of coolants have organic acids as their additives to prevent the cooling system from corrosion.

Corrosion Inhibitors

So if you don’t know what a corrosion inhibitor is then it is a compound in the coolants which lowers their corrosion rate, which is a very important factor in a coolant liquid. Orange and green coolants use different corrosion inhibitor ingredients.

Green coolant uses silicates, borates, and phosphates as additives, which are corrosion inhibitors while on the other hand orange coolant uses carboxylates for this task.

Reaction with Hard Water

Green Coolant

Green coolants mainly consist of silicates and borates as corrosion inhibitors as we have told you above. But the main problem with them is that phosphates react with hard water and forms scales or precipitates on the surface, so while mixing water in a green coolant you should always remember not to use hard water with it otherwise the scales will form on the surface of the cooling system which is very hard to remove.

Orange Coolant

Orange coolants on the other hands consist of carboxylates as the corrosion inhibitor in them, which only reacts to the surfaces which need prevention, and because of this property, on using hard water mistakenly with an orange coolant, scales will not form on the whole surface of the coolant system walls.


If your car runs on a green coolant then you need to replace the coolant more frequently otherwise it will damage the cooling system if you will use it for a very long time, the approximate lifespan of a green coolant is 3 years.

But if your car runs on an orange coolant then you will be happy to know that the lifespan of an orange coolant is long, and you can use it safely for 5 years.


Now you know that using which coolant depends on what components the cooling system of your car consists of. But if you are unaware of this thing then check the car’s manual, it will tell you the correct coolant for your vehicle according to its specifications.

Frequently Asked Questions

Question 1: Can I mix orange coolant and green coolants?

Many times people end up mixing orange and green coolants without realizing the effect it can produce on the engine of their vehicle. Yes, it is not as harmful to produce explosion or hazard and all but it can damage several parts of the engine.

Since you know now that these coolants have a different composition as one uses inorganic components and the other uses organic components therefore it can be a very bad idea to mix these two coolants.

When you mix these two coolants they will react with each other and the resulting mixture will be a thick fluid, our coolant system needs a coolant that flows properly not a coolant that will have to overcome resistance in flowing. This resulting thick coolant can also clog the passages of the cooling system and this can stop the flow thus affecting the working of the cooling system of a vehicle.

This thick coolant can also affect the water pump, a water pump is a part of the system which produces pressure to the coolant to flow in the whole cooling system, but because of this newly created coolant the water pump will overheat and this will also heat the engine and thus the cooling system will lose its significance of maintaining the temperature of the engine and this condition will also damage the other parts such as cylinder head, head gaskets, etc.

So you can see how much a simple mistake can make you suffer.

Question 2: I have mixed orange and green coolants, now what should I do to prevent my car from the consequences of this?

Do not worry, you can fix this issue by performing a flush but for that, you will need a flush kit and also some technical knowledge, and since this issue can cost you a lot after some time so it will be good to take your car to the mechanic for performing the flush rather than taking the issue in your hand and it will not even cost much initially.

Question 3: How to maintain an engine coolant perfectly?

It does not matter which coolant you are using, if you will not check it regularly then your car will eventually suffer damage. So to properly maintain an engine coolant check its level is up to mark or not because less coolant will allow the oxygen to enter and the oxygen will react with the system and the system will corrode. Also, keep checking the quality of the coolant from time to time. tries to give you one platform that saves your time in today’s hectic schedule and also puts an extra effort to make your decision better, wiser and, economical whenever you spend even a single penny over the internet.

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