1, water pipe joint, water pipe itself leaks, replace the water pipe or strengthen the seal;
2. The cylinder body is cracked, the cylinder head gasket is lax or damaged, and water channeling occurs;
3. The oil radiator sealing ring is damaged or has sand holes, resulting in cross-flow of water;
4. The water tank cover is not tight;
5. The heater water tank leaks;
6. The tee leaks.
Judge small experience:
1, see if the exhaust pipe emits white smoke. If it does, boil water, it may be that the cylinder block is cracked, and the cylinder head gasket is lax or damaged;
2. If there is a crack in the cylinder: the water tank will return air upward, but the pot is not boiled;
3, the cylinder head gasket is lax or damaged, which will cause insufficient power of the car;
4. When the engine is running, you can check whether there is water leakage at each interface with a rag or absorbent paper towel.
5. Fill the water tank with water, don't cover the water tank, start the engine, and refuel to about 2000 rpm to see if there are bubbles in the water tank. If yes, the air duct of the cylinder gasket is flushed, and the cylinder head is likely to be deformed;
6. If the oil cooling sealing ring is damaged or has sand holes, you can check whether the oil has water drops and emulsifying phenomenon to make a judgment.