Engine coolant

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In this article I explain what is and how the engine coolant works. Also I show you tips of which refrigerant to use.

Engine coolant

Hello that, today in the following lines I will explain that despite being so simple because it generates many doubts among the users of vehicles. Well today's topic is the liquid refrigerate.

What is the refrigerant?

The engine coolant is a liquid that is responsible for transporting the heat generated by the combustion of the engine to the radiator so that it can be irradiated to the atmosphere, and then in this way keep the temperature of the metals of the machine safe.

Previously and more in our tropical countries was used (still quite used) only water as a coolant, but nowadays there are mixtures that not only improve the performance of water as a coolant, but also give antioxidant qualities that are important for increase the service life of the water pump, its seals and the engine pipes.

What does the coolant possess?

Now, I'm not going to explain what chemical substances each refrigerant has because the manufacturer usually adds cocktails that only a gas chromatograph can decipher. Hahaha.

But well, thank God there is a rule that regulates the capabilities of the refrigerant so that we can choose better which suits our needs. I show them below:

Tipos de refrigerante del motor

As you can see in the previous image, in general terms when you buy an engine coolant you have to have a concentration of three main components that are Distilled Water, Anti-Freeze and the identification dye, the rest is as a manufacturer's bonus.

What is sought in a refrigerant?

The main thing for the refrigerant to fulfill its function of heat transport, is that it always remains in a liquid state. This is why the water is added anti-freeze so that if it increases / lowers the ambient temperature, it stays in the liquid state.

As you can see in the previous table, as we add antifreeze, we vary the freezing and evaporation temperature of the water so that it adapts to the needs we need.

Without for some reason the water starts the process of evaporation in some areas of the engine, it will totally lose the quality of heat transport, in addition because the pump can not pump water vapor efficiently, the engine will run out of coolant supply starting in this way a cascade process that will evaporate all the water and reheat the engine in a few minutes.

Why are there so many types?

Well there are several types because not everywhere in the world we are always at the same temperature, and that is why we must choose the one that best suits our conditions. It is important to add that as we go down the scale, the refrigerant becomes more expensive and for this case it is not fulfilled that the more expensive the better; that is, if our car uses blue refrigerant and we put it red, it will not cool the engine anymore, nor will the temperature exchange be more efficient since this work does not depend on the refrigerant but on the refrigeration system as such (Remember ... the refrigerant only transports The one that cools the engine is the radiator). So what we will do is lose money unnecessarily.

Which one to use?

Before talking about which refrigerant to use I would like to add additional information. The protection temperature ranges indicated in the graph indicate freezing / evaporation at atmospheric pressure. What does this mean? For example, if we put the blue refrigerant in a pot without lid, it will start to boil at 104ºC. Now, this is not our case since the refrigerant is contained within the system under pressure, so if we remember our chemistry classes, when we increase the pressure of a liquid we vary the freezing / evaporation temperatures and it will boil at a higher temperature.

Now with this information we can decide which coolant to use, in our case it is a tropical country we can use from yellow to 80% distilled water to green to 60%. As you can see even though the pressure of the system is lost, it will still be able to maintain its heat transport properties because we do not have such extreme temperatures.

In any case, always check the color recommended by the engine manufacturer.

This is all for today, I hope you like it.

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Written by

Dennis García

Mechanical Girl



Excelente como siempre

Muchas gracias por compartir.

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    Engine coolant

    Engine coolant

    In this article I explain what is and how the engine coolant works. Also I show you tips of which refrigerant to use.

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    3 Question(s) answered

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    • Asked by Igor Campos
      on 05/11/2019
      Saludos Dennis, cuando se cambia se vacia o se pierde el regrigerante y se llana de nuevo el sistema por,donde se espurga el mismo para que no le quede aire. Caso de Cheey Orinoco. Answer:
      Que tal Igor, para el Chery Orinoco solo hay que dejar la tapa abierta del contenedor. El sistema es cerrado y todo se purga hacia el contenedor. No como en el Arauca que el sistema es abierto donde si hay q sacar la manguera de retorno de calefacción para purgar.
    • Asked by Jesus Rodríguez
      on 08/28/2019
      Hola buenas noches de verdad que me gustan tus videos por lo menos enseñas muchas cosas buenas , bueno me puse a limpiar el radiador como en unos de tus videos pero quiero sabes que refrigerante le debo echar y la cantidad saludos desde ciudad bolivar Answer:
      Que tal Jesus, refrigerante verde si estas en Venezuela o paises tropicales. del resto debes cambiar entre verde y rojo dependiendo de la época del año.
    • Asked by Juan yanez
      on 04/11/2020
      Despues de vaciar el refrigerante en un chery q5 2017, al rellenar con el nuevo refrigerante . Veo que rellena el tanque de expansion pero no pasa hacia el sistema .. porque pasa y como solucionaro? Answer:
      Caramba Juan, no entiendo bien, se supone que debe entrar el agua si lo haces por la tapa. Sino, sacas una manguera del lateral para que saque el aire mientras se llena.

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