Effect of coolant
1. Winter antifreeze
In order to prevent the car from freezing in the winter and causing the water tank and the engine block to burst, the freezing point of the coolant should be lower than the lowest temperature of the region by about 10 °C in case of a sudden change in weather.
In the cooling system, the radiator, water pump, cylinder and cylinder head, water distribution pipe and other components are composed of steel, cast iron, brass, copper, aluminum, solder and other metals. The role of electrolytes is due to the different electrode potentials of different metals. Electrochemical corrosion is prone to occur; at the same time, the acidic product formed by the decomposition of the glycols in the cooling liquid and the acidic exhaust gas after the combustion of the fuel may also penetrate into the cooling system to promote corrosion of the cooling system. Corrosion of the cooling system will cause the lower water chamber of the radiator tank, the nozzle spacer, the cooling pipe, the joint and the water tank to be broken, and the corrosion products will block the pipeline, causing the engine to overheat or even smash; if the corrosion perforation, the coolant penetrates into the combustion chamber. Or the crankcase can cause serious damage, because when the coolant or water is mixed with the body oil, oil and gel are generated, which weakens the lubrication, and the valve, the hydraulic valve push rod and the piston ring are bonded. Therefore, a certain amount of anti-corrosion additive is added to the coolant to prevent corrosion of the cooling system.
3. Waterproof scale
The coolant should reduce the generation of scale as little as possible in the circulation, so as not to block the circulation pipeline and affect the heat dissipation function of the cooling system. In summary, when selecting and adding coolant, it should be cautious. First, you should choose the right ratio of coolant according to the specific situation. Next, add a coolant. Add the matching coolant to the water tank to make the liquid level reach the specified position.
The coolant that meets the national standard usually has a boiling point of more than 105 ° C. Compared with the boiling point of water of 100 ° C, the coolant can withstand higher temperatures without boiling (opening), to a certain extent, to meet the heat dissipation of high-load engines. Cooling is required.