The root cause of the water leakage phenomenon is as follows: 1. The crack on the cylinder block causes the upper plane to deform. 2. Cylinder pad dirt is dirty or burned through. 3. Cylinder head bolts are loose or dirty and corroded by dirt. 4. The radiator is corroded or damaged by the fan. 5. The water seal of the pump is damaged. 6. The water pipe is broken due to corrosion. If the engine's cooling water leaks, this will not only cause troubles of frequent refilling, but also cause the engine to overheat if the water leakage is serious. If the driver cannot find and take corrective measures in time, it is very easy to cause the cylinder to be pulled. , Then the piston and cylinder sleeve are stuck. If a large amount of coolant flows into the engine oil through the piston ring, it will dilute or even emulsify the engine oil, causing serious failures such as the crankshaft bearing bush burning.