Chapter 196: Antifreeze

Ordinary maintenance is too simple and easy for Fang Yuan, who now has the primary maintenance skills of second-hand cars.

Fang Yuan didn't want to tell Zhou Hongbo directly, Xiaobao is to change the engine oil and oil filter, and Dabao is to add air filter, air conditioning filter, fuel filter, spark plug, brake fluid, transmission oil, power steering oil, spark plug, etc.

So many maintenance items do not need to be replaced every time, the specific maintenance items and replacement cycle do not need to listen to what others say, and do not need to ask others, the most accurate and authoritative maintenance cycle refers to the requirements of the car maintenance manual to maintain.

In addition to the rotary engine, and F1 cars, ordinary cars are not so squeamish, excessive maintenance is a waste of money, neglect of maintenance will damage the car, at most shorten the maintenance interval after the car ages.

After explaining in detail how many kinds of spark plugs there are, how to look at the number of engine oil, how many types of brake fluid there are, how many ways to change engine oil, etc., Fang Yuan finally emphasized that we must not be careless when changing antifreeze......

When Fang Yuan explained, Zhou Hongbo kept nodding his head again and again, feeling that Fang Yuan was very detailed, and at the same time felt that Zhenghong Auto Dealership had a professional store manager like Fang Yuan, and his strength must be very strong, otherwise he would not be able to retain such an excellent talent, but he felt that Fang Yuan deliberately emphasized the inconspicuous detail of antifreeze at the end, and asked with some curiosity: "Isn't it antifreeze?

"Antifreeze should actually be called coolant, and its role is not to prevent freezing in winter, but to dissipate heat from the engine at ordinary times. ”

Antifreeze helps the engine dissipate heat and protects the engine by circulating it in the engine waterways and heat dissipation tanks.

The reason why it is called antifreeze is because the effect of antifreeze in winter is particularly significant, and people remember this effect, so it is commonly known as "antifreeze".

The lack of antifreeze sometimes has more serious consequences than the engine burning oil, the water temperature is high, there is no warm air, etc., it is still light, and the heavy will cause the engine to pull the cylinder due to poor heat dissipation.

Fang Yuan took the situation of Tianhong's second-hand car market as an example, for example, ordinary car dealers dare to collect BMW, Audi, and Mercedes-Benz that burn engine oil, even if the problem is serious, it is fine, but he is afraid of the engine that pulls the cylinder, even after the overhaul, don't think about selling it smoothly to make more money.

"I thought that antifreeze only served as a winter freeze preventer. Zhou Hongbo smiled bitterly, "When I was a child, I saw my father doing maintenance for the unit's car, which seemed to be directly added with water. ”

"As I just said, antifreeze has the function of antifreeze and anti-boiling, the freezing point can generally reach about minus 40 degrees Celsius, and the boiling point can reach about 130 degrees Celsius. ”

Fang Yuan explained seriously that the antifreeze must insist on using the same brand, if it is used indiscriminately, the inner surface of the engine cylinder will be corroded with potholes, and it cannot be sealed at all after disassembly and maintenance.

"So serious?" Tong Lei and Zhou Hongbo exclaimed at the same time.

Especially Zhou Hongbo, who didn't care about it just now, chuckled in his heart, and secretly glad that he met Fang Yuan today.

Zhou Hongbo and Tong Lei didn't expect that coolant, which they usually don't pay attention to, was so important, and the two of them unanimously asked Fang Yuan to talk about it in detail.

Fang Yuan, who had stopped explaining, had to explain in detail that the replacement cycle of coolant is generally two to three years or four to sixty thousand kilometers for different brands and models.

In the process of driving, it is necessary to always pay attention to the lack of fluid.

Nowadays, most models have a coolant level sensor, and if too much is missing, the engine will light up the fault light to alert the owner.

If your car doesn't have a coolant level sensor, it doesn't matter, just check your car more and pay more attention.

There are two things you need to pay attention to during your own independent inspection.

The first is the level of the coolant.

The check of the liquid level is very simple, and the upper and lower limits of the liquid level are generally marked on the coolant kettle, as long as the liquid level is between the upper and lower limits.

Another point to check is the freezing point of the coolant, which is the temperature at which the coolant solidifies.

Dahai City is located in the southwest border of China, and there are almost no winter troubles, but in the northeast and northwest, antifreeze is very important.

Just like in winter, if there is no protective measure for the outdoor water pipes in the Northeast, there may even be freeze and explosion, and these problems will also be encountered for precision instrument engines.

If coolant freezes inside the engine in the winter, it can damage the water tank, water pipes, and even the engine block.

With the use of coolant for a long time, the alcohols in it may gradually volatilize, and finally have an effect on both the freezing point and the boiling point.

Therefore, in areas with low temperature in winter, it is necessary to check the freezing point of the coolant to ensure that its freezing point is low enough that it will not be frozen in winter.

Checking the freezing point of coolant requires a freezing point gauge, which is usually available in repair shops.

Just suck a little coolant from the kettle, drip on it, and look at the light, the blue and white dividing line corresponds to the freezing point of the coolant.

If you find that the freezing point of the coolant is too high, it needs to be replaced.

As for the replacement, it is very simple, many models will have the recommended original antifreeze, if conditions allow, choose the brand recommended by the original factory.

If there is no brand recommended by the original manufacturer, then you should buy as reliable as possible, and it is best to be consistent with the coolant used in the original car, because the composition of different brands of coolant is also different, try not to mix coolant, in case there is any chemical reaction between the two coolants, etc., blocking the engine waterway, it will be troublesome.

Before adding antifreeze to the kettle, take a look at the precautions on the labeling of the bottle.

For example, BMW's original antifreeze says that it is recommended to mix it with water one-to-one, and the freezing point after mixing is -40 °C.

Of course, it's okay to just add the stock solution, but such a low freezing point is a pure waste of money, not to mention that it is not of the slightest use in southern China, even in the whole of China, unless you want to drive to the North Pole, the South Pole.

In addition, there is now a kind of anhydrous coolant, first of all, some brands of anhydrous coolant are really expensive, and it may cost thousands of dollars to replace it once, although it is free to replace it for life, but it is not worth it.

Secondly, waterless coolant cannot be added to water, adding water may lead to engine failure, and it will be embarrassing if you really encounter an emergency halfway.

"Emergency?" Tong Lei asked curiously, "What if I really encounter this situation and there is no antifreeze?"

"If you use ordinary coolant, you can also make it happen by adding water directly temporarily. But Fang Yuan warned Tong Lei that if you don't have antifreeze on hand, you can add a little water, but the water you add must be distilled or purified water, and you must not add tap water.

Even mixing antifreeze with tap water can cause rust in the waterways, and there is a risk of creating limescale that will clog the waterways, where stones can be formed, just like when a person is sick.