What happens if the coolant is not replaced for a long time?
4 Answers
If the coolant is not replaced for a long time, scale will form in the engine's water passages, which may clog them. Prolonged failure to replace the coolant can also lead to an increase in the freezing point and a decrease in the boiling point of the coolant, affecting the normal operation of the engine. Therefore, it is recommended to replace the coolant on time. The full name of coolant is antifreeze coolant, meaning it has antifreeze properties. Antifreeze prevents the coolant from freezing and cracking the radiator or damaging the engine cylinder block during cold seasons. Antifreeze is not just for winter use; it should be used year-round. In regular car maintenance, the engine antifreeze should be replaced every year.
Back when I drove my old classic car, I always thought coolant didn't need frequent changes. Then during a long trip, the engine suddenly overheated and nearly stranded me on the highway. The mechanic later found all the anti-corrosion additives in the coolant had depleted, leaving the pipes full of rust and sediment that clogged the cooling passages. The water pump was also corroded and leaking. The repair cost me thousands and caused major delays. Regularly replacing coolant prevents engine overheating and freezing - it's both cost-effective and worry-free. I regret ignoring the manual's recommendation to change it every two years or 30,000 km. This taught me maintenance shortcuts aren't worth it - engine overhauls aren't just expensive, they compromise driving safety, especially when winter freezing damage compounds the problems.
After working in the workshop for so many years, I've seen the disastrous consequences of cars not changing their coolant for a long time. When the coolant deteriorates, the antifreeze additives fail, making it prone to corroding the radiator, pipes, and engine components, leading to leaks or even blockages. Over time, cooling efficiency drops, the fan runs wildly, and the water temperature remains high. In severe cases, the engine block may even warp. Simply put, fresh coolant protects metal from rust and absorbs heat better, while old coolant accumulates deposits, making repairs difficult and costly. I recommend car owners regularly check the coolant level and color. If it appears cloudy or discolored, change it immediately. Spending a little money now can prevent major issues and extend the engine's lifespan by several years.
I didn’t pay attention to the coolant when I first started driving, and only realized the severity after a friend reminded me. Long-term neglect reduces its antifreeze and anti-boil functions, risking engine cracks from freezing in winter or overheating and smoking breakdowns in summer. Deteriorated coolant also corrodes internal parts, causing leaks in the water pump or radiator. Generally, replacing it every two years is sufficient—it’s not expensive and saves costly repairs later. Remember, timely maintenance ensures peace of mind, especially checking the fluid level and color before long trips.
