The damage to the engine by high temperatures is very large, so how to operate correctly when the engine high temperature fault light on the dashboard determines the size of the loss. However, after encountering high temperatures, everyone seems to have some differences on how to deal with them. Some people also believe that after high temperatures, the engine should be extinguished first to reduce the generation of heat. Some people also believe that they should idling on the spot, rather than turning off the engine immediately after the high temperature. The engine can be cooled gradually when idling, so if the engine is turned off immediately, the temperature inside the engine is still very high, which will continue to cause damage to the engine. Which statement is true? For private cars, the first time after the high temperature alarm light on the dashboard is turned off is undoubtedly the best countermeasure. If handled well, the engine has no problems. Idling on the spot is likely to cause serious engine failure. In order to make everyone better understand, let's talk about this today.
Will the engine continue to be damaged immediately after the high temperature is extinguished? It is said that it is not good to turn off the engine as soon as the temperature is high. At this point, the temperature inside the engine is very high because this heat can continue to damage the engine. This statement sounds very reasonable, but it is actually impossible. Because gasoline burns very quickly in the combustion chamber and is discharged immediately after combustion, it is not enough to transfer a lot of heat in such a short period of time. This is the same reason why the hand does not feel hot as the hand quickly passes through the flame of the candle behind it. In addition to this, the combustion chamber sucks in air and gasoline as the engine is inhaled. The temperature of the air is almost the same as the ambient temperature, which allows the combustion chamber to be cooled. The temperature inside the combustion chamber is actually not as high as we think, because the gasoline can be cooled again when it evaporates
The really high temperature in the engine is actually the exhaust manifold. The high-temperature exhaust gas after combustion is discharged through the exhaust manifold, but the exhaust manifold is relatively long, and the high-temperature exhaust gas has enough time to contact the exhaust manifold here, so the temperature of the exhaust manifold is the highest. The image above shows the engine thermal imaging system, showing the brightest part of the red circle on the right and the highest temperature. Here is the exhaust side of the engine. The exhaust manifold itself is made of cast iron and has excellent heat resistance, so there is no need to worry. Can I cool down on the spot when idle at high temperatures? Some people think that when the high temperature alarm should be idled on the spot. The reason is that the engine heat generation is minimal when idling, and the continuous operation of the engine can make the water pump, oil pump, and cooling fan work continuously, helping the engine to quickly dissipate heat and reduce the temperature.
In fact, this statement is completely untenable. Because they ignore very important factors. There is a problem with the cooling system. The heat dissipation capacity of the car's heat dissipation system is very strong, and it will not become hot if there is no problem. After high temperature, there is a problem with the heat dissipation system and the heat dissipation cannot be dissipated normally. At this time, even if the idle speed is expected to dissipate heat, the temperature of the engine will continue to rise, eventually resulting in deformation of the outer cover, holding tiles, cylinders being pulled, and the engine completely shutting down. Do not take the heating rate at idle speed lightly. Because the vehicle is stationary during idling, there is no airflow in the front of the car, the speed of external heat dissipation of the engine becomes slower, and the actual temperature rise rate is still very fast. If the car is completely hot in the summer, if it is idle on the spot, the electronic fan will be activated in 1-2 minutes. The water temperature alarm is an early warning and cannot replace the engine, what message do you feel it conveys to you when the engine's high temperature fault light is lit? 1, the water temperature is a little wrong, please stop immediately to turn off the fire check. Failure to do so may damage the engine. 2, haha, the water temperature is too high, your engine is turned off.
If you're an engineer, what kind of message do you think water temperature alarms should convey to drivers? It must be the first one. Drivers should be informed in advance of measures taken to avoid collisions when there is a risk of collisions, such as car crash alarms, rather than telling the driver that a collision occurred after a collision has occurred. Because the engine water temperature is managed by the engine control computer, the water temperature will change within a certain range when the engine is working normally, but the engine control computer always monitors the water temperature, if the water temperature is found to exceed the warning value, it will immediately light up the high temperature warning light to warn the driver, but for example, when an engine is running normally, the water temperature changes between 85-97, and after the water temperature exceeds 98, the control computer lights up the high temperature alarm light. At this point, the temperature of the engine is only higher than the usual operating temperature1. Do you think the water temperature at this time will cause damage to the engine? It must be impossible. If a car just lights up the high temperature alarm light and damages the engine, it can only be said that the manufacturer's water temperature alarm setting has a major error.
So, by now we should have known it clearly. When the water temperature warning light is lit, there may be a problem with the engine's cooling system. However, the water temperature at this time has not yet reached the point of damaging the engine. By stopping and stopping the engine at the first time, preventing the engine from continuously generating heat, the engine can be prevented from any damage. Idle is basically impossible. The engine will continue to heat up when idling, but there is a problem with the heat dissipation system, which cannot be dissipated smoothly, and eventually the water temperature will continue to rise, and the engine may be seriously damaged.