What are the effects of adding a bottle of mineral water when the coolant is insufficient?
2 Answers
Adding a bottle of mineral water when the coolant is insufficient can cause the freezing point of the antifreeze to rise. The mineral water may react chemically with the components in the antifreeze, affecting its functions such as anti-boiling, anti-corrosion, anti-scaling, and lubrication of the cooling system. It is best not to add water to the coolant because the coolant will deplete due to the high temperature of the engine during use. When the coolant level drops below the tank's scale line, it should be replenished promptly. If coolant is not available, distilled water can be added—half water and half coolant is also acceptable. However, once at a repair shop, the water in the tank should be completely drained and replaced with new coolant. Coolant replacement cycle: Coolant is a consumable item in cars. Generally, it needs to be replaced every two years or 40,000 kilometers. However, if you drive frequently, the replacement cycle may need to be shortened. Precautions for replacing coolant: When replacing coolant, it is advisable to choose a high-quality product. Good coolant offers better heat dissipation and rust prevention. It is important to note that when adding coolant, it is best to use the same type. Avoid mixing two different coolants, as this may produce highly corrosive acidic substances that can damage the radiator.
Last time the coolant light in my car came on, and I couldn't find the specific fluid, so I added a bottle of mineral water as an emergency measure. It worked fine for a few days, but later I noticed a rusty smell in the engine compartment. Upon inspection, corrosion marks were found at the radiator connections. The mechanic explained that coolant isn't just pure water—it contains antifreeze, rust inhibitors, and lubricants to protect the entire cooling system. Mineral water contains minerals and impurities, which can temporarily maintain the water level in a pinch, but over time, it dilutes these additives, lowering the boiling and freezing points. This makes the engine prone to overheating in summer and risks freezing and bursting pipes in winter. It also accelerates rusting in metal components, potentially causing leaks or damage to the water pump and radiator fins. If you ever run low on coolant, it's best to use distilled water as a temporary solution and then top up with professional antifreeze as soon as possible.
