A. Reason: The water channel of the engine, like the combustion chamber, is discharged into the exhaust pipe after combustion and discharged after cooling.
Judgment method: In this case, there will be obvious water shortage in the engine water tank;
B. Reason: water enters the exhaust pipe after washing the car or for some reason, and the exhaust gas blows the water out of the exhaust pipe after the engine stops;
Judgment method: in this case, the engine water tank will not be short of water, and the hot and cold cars will drain water;
C. Reason: The air is humid and the temperature is somewhat low, and the hot air in the exhaust pipe is mixed with the cold air to produce water;
Judgment method: Generally, it appears more when the car is cold or winter, and generally disappears after the car is hot.