Can You Directly Add Water When the Engine Temperature Is Too High?

[JoannaRose]

You cannot directly add water when the engine temperature is too high, as the engine block may crack due to excessive temperature differences. The effects of an overheated car radiator on the engine include: 1. Expansion of engine components reduces the clearance between parts, increasing engine wear; 2. Decreased oil viscosity leads to accelerated wear of components and reduced engine lifespan; 3. Damage to the cylinder head gasket may cause cross-flow between water, oil, and air passages, allowing oil to enter the radiator or water to mix with engine oil. The function of the engine is to convert the thermal energy of gasoline or diesel into mechanical energy by burning the fuel in a sealed cylinder, expanding the gas, and driving the piston to perform work.

[AlessandraMarie]

Last week I experienced an overheating engine on the highway - you really can't just pop the hood and add tap water! The dashboard warning light was glaring red, and the veteran driver in the passenger seat immediately had me pull over and shut off the engine. He explained that when the engine is scorching hot, the cooling system has tremendous pressure, and opening the cap could spray scalding hot steam. I've learned my lesson now - I always keep bottled purified water in the car for emergencies. After the engine completely cools down, I mix the purified water with coolant according to the manual's ratio before refilling. However, the mechanic told me that long-term water use can cause scaling in the radiator and corrode metal pipes. The safest approach is to get a comprehensive check at the dealership for potential issues with the cooling fan or water pump.

[AthenaLee]

Having run an auto repair shop for twenty years, I've seen countless cases where engines were ruined by directly adding tap water. When climbing hills with full AC in summer and the temperature gauge needle hits red, never open the radiator cap immediately – my toolbox contains wrenches deformed by steam burns. Wait half an hour for the engine to cool, then slowly loosen the cap with a damp cloth as padding. Distilled water can be mixed in as an emergency fix, but proper antifreeze must be replaced afterward. Last year, an off-roader that had long used water suffered a rusted-through radiator causing head gasket failure, costing over 8,000 yuan in major repairs. Remember: check hose clamps for leaks, and inspect fuses if the fan stops working.

[MacAlexis]

During the last road trip, the engine temperature warning light came on. My companion immediately grabbed a bottle of mineral water to top it up, but I stopped them just in time. Later, the tow truck driver taught us a clever trick: turn the heater to maximum setting immediately to help dissipate engine heat rapidly. After parking and turning off the engine, test the hood temperature with the back of your hand – only proceed when it's completely cool. I now carry concentrated coolant in my car, which can be mixed with purified water for emergency use. Long-term use of plain water can cause rust buildup in the radiator and may freeze and crack pipes in winter. Back home, diagnostics revealed a stuck thermostat – replacing it for 200 yuan solved the problem.