How Often Should a Car Have Its Coolant Topped Up?
2 Answers
For small cars, high-quality coolant generally needs to be topped up once a year. For vehicles that run for extended periods, such as taxis, it can be topped up every two years or every 30,000 kilometers. Coolant prevents the freezing of the liquid in the cooling system during cold winter stops, which could otherwise crack the radiator or damage the engine block or cylinder head. To avoid excessive foaming that could reduce the heat exchange efficiency between the coolant and engine components, ensure the product is within its validity period when adding it. Long-life coolants can have a validity period of up to three years. If suspended particles, sediment, or signs of deterioration or discoloration are found in the coolant, it should be replaced promptly, and the system should be cleaned. How to Choose Coolant: The basic indicators for coolant are its freezing point and boiling point. Available in the market are coolants with freezing points of -15℃, -25℃, -30℃, -40℃, etc. It is advisable to choose a coolant with a freezing point at least 10℃ lower than the lowest temperature in your region. Can Different Coolants Be Mixed? It is necessary to use the same brand of coolant. Different brands may have varying production formulas, and mixing them could lead to chemical reactions among the additives, rendering them ineffective.
I've been driving small cars for over ten years, and coolant doesn't need frequent top-ups—the key is regular inspection and replacement. I check the fluid level every six months or so, opening the hood when the engine is cold to check the markings on the expansion tank, ensuring it's between the min and max lines. If it's a bit low, I add a little pre-mixed coolant, not pure water, to avoid diluting the concentration and damaging the system. The frequency of top-ups is actually quite low unless there's a leak—such as noticing water stains on the ground or an engine overheating warning, which should prompt a leak check. Generally, coolant should be replaced every two years or every 30,000 kilometers for optimal performance, as it prevents freezing, boiling, and protects the engine from rust. Related to this, before the harsh winter in northern regions, it's essential to ensure the concentration meets standards—use a hydrometer to test if it can withstand temperatures as low as -40°C, ensuring safer and more reliable driving.
