In winter, the weather is cold. In order to prevent the body from freezing, it is necessary to add antifreeze in the cooling system of the engine. Currently used antifreeze are ethanol, ethylene glycol, glycerin, glycerol-ethanol, etc. These antifreezes have different condensation points due to their different proportions and compositions. Under normal circumstances, the freezing point of the selected antifreeze should be lower than the local minimum temperature of 10 °C -15 °C, so as not to exceed the freezing point of the antifreeze, so that the antifreeze loses its protective effect. The following points should be taken into account when using antifreeze: 1. Before adding the antifreeze solution, remove the scale from the cooling system and remove the residual water so as not to dilute the antifreeze solution and reduce the freezing point of the antifreeze solution. 2. When adding antifreeze, only add 93%-95% of the cooling system capacity. Antifreeze has hygroscopicity and the cooling system should be sealed. 3, ethylene glycol, ethanol, toxic, do not touch the skin, do not use mouth to prevent poisoning. 4. Ethylene glycol is an organic solvent. When filling, do not leak, spill or dribble on the body and surface paint to prevent paint from falling off. 5. When glycol and glycerol are reduced due to volatilization, fresh water should be added in time. After the leakage, the same type, the same freezing point antifreeze should be added. 6, ethanol, glycerol - ethanol antifreeze, the contained alcohol is volatile and flammable. Therefore, use caution when using fire. When the volatile surface of alcohol is reduced, it can be supplemented with 80% ethanol and 20% water. 7. All kinds of antifreeze fluids of different types, different types, and different freezing points cannot be mixed and mixed.
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