1, insufficient coolant
Starting a long-term water circulation will slowly drain the coolant in the engine cooling system, resulting in water shortage in the water tank. If the owner fails to check and add coolant in time, it is easy to cause the engine water temperature to be too high.
2. Water tank leaks
The water tank connecting pipe is broken or loose, which will cause water leakage. At this time, the water circulation will be blocked, and if it is serious, the engine will be boiled.
3, cooling fan failure
Damage to the cooling fan or short circuit of wires will cause the fan to work or the cooling fan to rotate slowly, which will cause the heat of the engine to be unable to dissipate, and the water temperature of the engine will naturally rise.
4, thermostat failure
Thermostat is a device that controls the flow path of coolant. Once it is stuck or fails, the cycle of the engine will be affected and the heat of the engine will not be effectively dissipated.
5, water pump failure
After the water pump fails, the heat-conducting water of the engine cannot be updated in time, so the water temperature will rise rapidly after the engine is started, and the water temperature alarm light on the dashboard in the car will also light up.
Too high water temperature is commonly known as boiling pot. Boiling will lead to deformation and even damage of cylinder head and cylinder block.
When the temperature is high, it becomes difficult for the water tank to dissipate heat, the engine water temperature will rise to varying degrees, the rubber hose will soften more easily, and the cooling water will leak. Therefore, it is common that the water temperature is too high or even boiling during driving. Normal engine water temperature should be constant between 85-95 degrees Celsius. When the water temperature is too low, the fuel can not be atomized well when entering the cylinder, and the power and economy are not good. Moreover, the gap between parts is too large at low temperature, and the noise and vibration will be greater. However, if the water temperature is too high, the oil viscosity will become thinner and the lubricating strength will decrease. At the same time, the piston, valve and other high-speed moving parts are more prone to deformation, resulting in engine weakness. In severe cases, the expanding and deformed piston will strain the cylinder, and the crankshaft bearing will dissolve and lock the crankshaft, with disastrous consequences. Therefore, if the pointer of the water thermometer is close to the red area, or the water temperature warning light is on, you should immediately pull over and check the flameout.