What is the function of antifreeze?
2 Answers
Antifreeze works by cooling the engine of a motor vehicle through liquid cooling, keeping it in the optimal working state. It prevents freezing in winter and boiling in summer. The full name of antifreeze should be antifreeze coolant, meaning a coolant with antifreeze function. Antifreeze prevents the coolant from freezing when the vehicle is parked in cold winter, which could otherwise cause the radiator to crack or the engine cylinder block or head to freeze. Its main components are: 50% purified water, 40% methanol, and 10% other substances. The basic indicators of antifreeze are its freezing point and boiling point. The market offers antifreeze with freezing points of -15℃, -25℃, -30℃, -40℃, etc. Generally, it is advisable to choose one with a freezing point at least 10℃ lower than the lowest temperature in your region. Vehicle antifreeze typically needs to be replaced every 2 years or 40,000 kilometers, which is just a reference interval. For commercial vehicles with longer mileage, the replacement cycle should be shorter. Since driving conditions vary for each vehicle, the replacement should be based on actual usage. Regularly check the antifreeze level. If it is found to be insufficient, replenish it promptly. If suspended particles, sediments, or signs of deterioration or discoloration are observed in the antifreeze, replace it immediately and clean the system. When replacing, always use the same brand of antifreeze. Different brands may have varying production formulas, and mixing them could lead to chemical reactions among additives, rendering them ineffective. Methods to determine if antifreeze is low: Observe the antifreeze warning light on the dashboard. If it lights up, it is likely due to low antifreeze, though it could also be caused by excessively high engine temperature. Check the antifreeze reservoir. If the level is below the minimum mark (MIN), do not continue driving and add antifreeze promptly. Check the water level scale on the antifreeze bottle. The normal antifreeze level should be between the maximum and minimum marks. If it is below the minimum mark, it indicates a shortage of antifreeze.
The main function of antifreeze is to ensure the normal operation of the vehicle's cooling system. In cold weather, ordinary water can freeze and expand, causing engine block cracks, but antifreeze has a very low freezing point, effectively preventing this. During hot weather, ordinary water is prone to boiling, leading to overheating, while antifreeze has a high boiling point, maintaining stable engine temperature and preventing overheating. It also contains additives to prevent rust and corrosion of metal components, extending the lifespan of parts like radiators and water pumps. With added lubricants, the coolant flows better, reducing friction and wear. It is recommended to check the concentration and color every two years to ensure antifreeze effectiveness and system health. Failure to replace it may lead to costly engine overhauls.
