How Does Antifreeze Work?

[Amanda]

Antifreeze works by preventing the formation of oil sludge and gum deposits when it mixes with engine oil, which can weaken lubrication and affect the connection of hydraulic valve lifters and piston rings. Antifreeze Composition: The main components of antifreeze are 50% pure water, 40% methanol, and 10% other substances. Antifreeze Replacement Interval: For vehicles that operate for long periods, such as taxis, high-quality antifreeze should generally be replaced once a year. For vehicles with shorter operating times, replacement can be done every two years or every 30,000 kilometers. To prevent excessive foam formation, which reduces the heat exchange efficiency between the antifreeze and engine components, ensure the product is within its validity period when adding it. Long-life antifreeze can remain effective for up to three years. If suspended particles, sediment, or signs of deterioration or discoloration are observed in the antifreeze, the system should be promptly cleaned and the antifreeze replaced.

[Tommy]

Antifreeze is the liquid that protects the engine cooling system, primarily relying on ethylene glycol to do its job. In winter when temperatures drop, water can freeze and expand, potentially cracking the radiator or engine block. However, with ethylene glycol added, antifreeze can lower the freezing point to -40°C or even lower, ensuring it remains fluid without freezing. During summer heat, water boils at around 100°C, causing engine overheating and boiling over, while antifreeze raises the boiling point to over 120°C, preventing vaporization issues. Simply put, ethylene glycol molecules disrupt water's freezing structure while also elevating the boiling point to balance heat transfer. Antifreeze also contains additives to prevent corrosion of internal metal components, extending system lifespan. The mixing ratio is crucial—typically a 50% water to 50% antifreeze blend works best. If not replaced periodically, old antifreeze degrades and risks losing effectiveness. I recommend checking the fluid level and color every two years to ensure worry-free driving safety.

[LaBeau]

On the road, antifreeze is one of my most trusted guardians. Its working principle is quite straightforward—unlike plain water, it doesn’t easily freeze into ice in winter or turn to steam in summer. The key lies in the addition of ethylene glycol, which significantly lowers its freezing point and raises its boiling point, maintaining it in liquid form year-round for efficient heat dissipation. From my experience, I check the fluid level before every winter and top it up if needed. Leaving it unchanged for too long increases its corrosiveness, risking clogged pipes and trouble. Keeping the engine temperature stable prevents sudden overheating issues on long drives. When replacing it, I also prioritize eco-friendly formulas, opting for low-toxicity types for peace of mind. Don’t underestimate it—this little fluid excels at freeze protection, boil-over prevention, and rust inhibition, offering immense practical value.

[DelAriel]

Antifreeze serves to prevent the cooling system from freezing and boiling, ensuring the engine operates normally. Its principle relies on ethylene glycol mixtures to adjust the physical properties of water—lowering the freezing point to prevent ice formation in winter and raising the boiling point to avoid vaporization in summer. The mixture ratio must be correct, with a 50-50 blend being optimal. If it degrades, the corrosion inhibitors fail, leading to internal rust or sediment buildup, which can cause leaks or blockages. Regular replacement is crucial—I typically follow the manual and change it every 2 years, as maintenance costs are far lower than engine repairs.