Why are some red and some green antifreeze for cars?

All the common sense about the use of automobile antifreeze is here _ automobile antifreeze.

Safety precautions for normal supplementary mode of mixed use mode of color components

This paper covers the above five points. First of all, it needs to be explained: antifreeze = coolant. These two terms refer to a kind of liquid, which is "engine blood" and has many functions such as antifreeze, cooling, cleaning and corrosion inhibition. Fuel vehicles use internal combustion engines, which will reduce thermal efficiency (power) due to "excessive cooling" in low temperature environment, so antifreeze must be heated during driving to reduce power loss.

But the engine body can't reach a very high temperature, otherwise the metal material will be damaged by high temperature, so the antifreeze must be circulated, constantly absorbing the heat of the engine and emitting it, and then receiving the heat of the engine after cooling, and so on. The function of antifreeze coolant will not be described in detail. Please refer to the dynamic cycle mode below.

Color function of antifreeze (abbreviation)

Cars have "three oils and five liquids". The main oil products are engine oil, gearbox oil, brake oil, steering fluid, coolant, glass water, battery electrolyte and so on. These oils have different properties and colors, which may theoretically leak due to hardware failure during normal use. What should I do to determine the fault point as soon as I find the oil leak?

If we check one by one in the traditional way, it will waste time, and if the oil is not "conspicuous", it will be difficult to find it, so normal driving will bring security risks. Then, it is very important to choose a method that can find the problem quickly. The way of identification is nothing more than "smelling", "listening", "touching" and "seeing" people. All kinds of gasoline engine oils may have no peculiar smell, but some engine oils are indeed toxic, so it is natural to use "vision" when looking for leakage points-adjust all kinds of automobile engine oils to different colors.

The bright colors of antifreeze are only for distinguishing and easy inspection. As for different brands of cars, the color of antifreeze will be different, because the colors of various oils in the car are not uniform. For example, if the glass water used for automobiles is red, the coolant must be blue or yellow to distinguish it. The glass water used for SUV is blue, and the natural cooling liquid should also use other colors. It's good to know why the coolant has a color. Let's discuss the relationship between the second function of coolant color and its composition.

Composition and toxicity of coolant (abbreviation)

Most coolants will use EG glycol as the main raw material, because the cost of propylene glycol (PG) and glycerol (glycerol) is high, but the cooling and antifreeze performance is not just needed, so low-cost EG is the first choice. But EG is only a part of the aqueous solution, and its proportion cannot exceed 60%. The reason is that when the proportion of EG is 0~60%, the freezing point (freezing point temperature) of aqueous solution will be lower and lower, as low as -48.3℃, but it will increase when it exceeds 60%. Therefore, the proportion of most EG coolant will be less than 60%, and the rest will be deionized water or distilled water.

After understanding the main components of antifreeze coolant, it is necessary to explain the color of coolant repeatedly: bright colors are not only used to distinguish and identify, but also play a warning role; After the specific gravity of EG aqueous solution reaches "1.6g/kg", if it is drunk by mistake, it is likely to die. So EG's bright colors are like all kinds of "poisons" in nature. This is to remind users to take care of it properly and not to let children or the elderly drink it by mistake-this kind of thing happens every year and can't be careless. At the same time, the waste liquid discharged from the cooling liquid should also be properly treated to reduce the possibility of damaging the environment or water resources.

Can antifreeze coolant be mixed?

Answer: Yes-real knowledge comes from practice. Antifreeze coolant is not a "high-tech" industrial product, and its main components and corrosion inhibitor components are basically "prescriptions" (the secret recipe of difference). It can be said that most cooling fluids are similar, and the anti-freezing and cooling function is always redundant; Therefore, the mixed use will not cause the performance difference of antifreeze across the range, nor will it affect the overall performance or fluidity, but the premise is that the raw materials are the same type, either EG or PG.

As for color, it's just the difference between colorants. In the field of after-sales maintenance of auto parts, it is normal for different brands and colors to mix the same type of coolant. Therefore, normal addition or replenishment of coolant can be mixed, but normal reduction of coolant during vehicle use should not mean replenishment of coolant. Let's talk about the focus of this article-how to compensate the loss of antifreeze coolant normally and how much it is lost.

"Water" of antifreeze coolant

To sum up, the main component of EG water-based coolant is actually water, especially in the central and southern regions where the ambient temperature is high. Antifreeze is basically "no need for antifreeze", and the proportion of all EGs is always low. EG is an oily viscous liquid, and its volatility is very undesirable-this is an advantage, because it evaporates as fast as water, which will increase the cost of car maintenance. In normal use, the main component of coolant is actually water, which will slowly evaporate during the high temperature baking of the engine. It is not surprising that the pressure inside and outside the anti-freezing pouring pot is constant and cannot be completely sealed, and the water volume is reduced.

Key points: The main component of reduction is water, which can be naturally supplemented. After the antifreeze is reduced, the same amount of distilled water or deionized water can be added. Distilled water is the easiest to find-ordinary raw water, mineral water, purified water and other drinking water can't be used, because this kind of water contains magnesium carbonate and calcium carbonate, which will precipitate to form scale (commonly known as water alkali) in high temperature environment. A large amount of "water and alkali" in the engine cooling pipeline will cause blockage, reduce the heat dissipation and cooling capacity, and cause damage to the engine. Therefore, the coolant can replenish water, but it must be distilled water. These substances are truly "pure water" after precipitation.

Summary: Refrigerant coolant can be replenished in the above way. After three times of water replenishment, the coolant can be replenished once to balance the proportion. The remaining coolant must be stored correctly. As long as the color can be separated from the glass water area, the color and viscosity of other oils are still very different. Just know the antifreeze coolant. (The figure below shows the reasonable replenishment amount of antifreeze coolant. )

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