How to Choose Coolant?
3 Answers
Here are the methods for selecting coolant: 1. Choose the freezing point (i.e., the ice point) based on the ambient temperature conditions where the car is used. The freezing point is a crucial indicator of antifreeze. Generally, it is advisable to select a coolant with a freezing point about 10°C lower than the lowest winter temperature in the local environment. 2. Select antifreeze according to the specific requirements of different vehicles. For example, imported cars and domestic passenger vehicles often use permanent antifreeze, while domestic trucks can use direct-use antifreeze, which can be replaced with softened water in summer. 3. Whenever possible, choose antifreeze that has rust-proof, corrosion-resistant, and descaling capabilities.
With over a decade of car repair experience, I focus on three key indicators when choosing coolant: freeze protection & boiling point, anti-corrosion capability, and service life. In northern winters where temperatures often drop to -20°C or -30°C, the freezing point should be at least 15°C below the local minimum temperature for safety. For drivers in southern regions with frequent high-temperature routes, opt for coolants with a boiling point above 110°C to prevent overheating. Modern mainstream organic acid-based coolants offer better protection for metal pipes and rubber components. Though slightly more expensive, they can last five years without replacement, proving cost-effective in the long run. Never compromise by buying cheap off-brand products—repair costs for corroded radiators could equal five years' worth of OEM coolant. Before refilling, always test pH levels with strips; the ideal range is between 7.5-8.5.
For pragmatists, choosing coolant boils down to four key points: match the color to the original specification, measure and adjust the concentration properly, align the freezing point with local minimum temperatures, and replace it at least every three years. Don't fall for so-called universal types—German cars often use pink G12-standard fluid, while Japanese models predominantly use green; mixing them can cause gel formation that clogs pipes. To test concentration, use a medical dropper to place a drop on a refractometer and read the scale line. Don't delay replacement cycles—degraded coolant resembles rusty water and can ruin the entire cooling system.
