According to the technical requirements of NB/SH/T052 1-20 10 Engine Coolant published by National Energy Administration, the boiling point of 50% antifreeze is above 100, and the loss is mainly natural volatilization. If it is not replaced, the annual loss is between 10%-36%. There are few things that need to be supplemented in 3~4 days, and they will be supplemented after 3~4 days. This shows that there is leakage of antifreeze. Rubber metal parts that are often exposed to high temperature will age due to thermal expansion and contraction, and antifreeze with slight cracks will penetrate. Water tank pipe, air conditioning hot water pipe, thermostat, pump seal, etc. Are common parts that cause infiltration. Regular inspection of sealant and fastening buckle and timely maintenance can ensure driving safety and prevent anchoring or accidents.
The inspection is also very simple. The antifreeze is composed of various additives, and there may be obvious additive deposits at the leakage point. However, due to the small space in the engine compartment and the complex structure of the cooling circulation system, it is difficult for car owners in some areas to check by themselves. Some new cars will have less antifreeze when they are first insured. It doesn't mean anything. Probably because the factory didn't add much. (William Shakespeare Hamlet's famous car quotation) () Make sure whether the antifreeze is reduced, add the normal face value, and drive for a while. It should be noted that when herbal tea and train are used, the level of antifreeze is different, herbal tea is lowered and the train is raised. Therefore, judging from the face value of antifreeze, it is best to look at it in cold tea. Of course, the train is ok, but it is right to release gas from the cooling system. The cooling system is closed and can withstand certain pressure. When the water temperature rises, the pressure of the cooling system is relatively high. When there is pressure in the system, part of the coolant is lifted and the water level of the kettle rises. When the water temperature drops and the pressure drops, the cooling water in the kettle flows back to the engine and water tank.
Freeze damage is normal. Although the system is sealed, the cover has a discharge function. If the pressure of the cooling system is too high, opening the overflow valve on the cover will release the pressure and the water vapor will be discharged from the cover. After a long time, the face value will drop when the emissions increase. But the speed of loss is not too fast. When the face value is added to the middle or upper limit, the loss within 1 year or 20,000 kilometers usually cannot be lower than the lower limit. If the loss is too fast, it needs to be added frequently. Some parts must have leaked, and the leakage is serious. It should be repaired in time to avoid sudden lack of coolant.
(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)