When the engine temperature is too high and the fan does not turn

When the water temperature sensor senses that the water temperature reaches the specified value, it gives a signal to the ECU, and after the ECU is judged, it outputs a low-speed rotation or high-speed rotation signal to the cooling fan. At this time, the fan rotates according to the signal, and the high temperature of the water tank (radiator) is carried away by the air to cool down.

Reasons for the high water temperature in the car:

Solution: The order is from simple to complex, from low cost to high cost.

1: Check whether the water tank is leaking, open the water tank, see if the water surface height is below min, if the water level is very low, it is likely to be leaking. Add water, open the exhaust screw near the engine to exhaust, and check for water leakage.

The presence of gas in the tank can also cause the water temperature to be high. Water leakage is generally a cool car leakage, so check after the hot car is cooled, pay attention to see if there is a leak in the warm air and water pipe joint leading to the driver's cab, and look at the ground under the car when you get up in the morning when the leakage is large. If there is no leakage, but the water gradually falls below the lowest point after a week or half a month of filling up the water, then there is another possibility that the cylinder gasket is leaking and the water seeps into the engine and consumes.

Open the oil filler to see if there is white foam and bubbles, see if there is oil in the water tank cap, and see if there are white water droplets on the oil dipstick. If so, water seeps in. The cylinder gasket needs to be replaced.

2: Change the water temperature sensor. If you don't boil the pot, it just shows that the water temperature is high, and it may also be caused by the inaccurate water temperature sensor. Change the water temperature sensor.

3: Change the thermostat. After the water temperature reaches 90 degrees, open the cabin cover and touch the water pipe near the engine to heat (be careful of hot hands), the water tank is not hot, that is, the water is not circulating. It's hot on both sides. Otherwise, the thermostat should be replaced.

4: Water change pump. The water pump is the most expensive, so you have to change it last.

I have seen with my own eyes that there are a lot of rubber strips twisted in the pump of my car, and the pump is not working well, and the water cannot be circulated, causing the water temperature to rise rapidly. This necessitates the replacement of the pump.

Nothing to do with thermostats and water pumps. First, the fan relay two fuses three temperature switches four fan motor or line faults.

The fan does not turn. This can result in an engine that is not overly high.

Examine. Fan motor.

If the fault cannot be troubled.

then the engine cooling system is detected.

Check what: large loop.

Small loops. Whether it is normal or not.

Whether the thermostat is working properly.

For detection methods, please refer to the online tutorial.

The reason why the engine fan does not rotate at high temperature:

1. Water temperature sensor failure: Check whether the engine water temperature sensor is faulty, the water temperature sensor failure will cause the ECU computer board to fail to receive the signal of high engine water temperature.

2. Faulty temperature control switch: Check whether the engine temperature switch is faulty, and the faulty temperature control switch will cause the electronic fan to fail to open.

3. Electronic fan failure: Check whether the engine electronic fan is faulty, the internal short circuit of the electronic fan will directly cause the electronic fan to not work.

4. Car ECU failure: Check the car ECU (central control computer board), ECU is the "brain" of the car. ECU failure can lead to the occurrence of various malfunctions of the vehicle.

Precautions for high engine temperature:

1. Pay attention to check and replenish antifreeze, the lack of antifreeze is the main reason for the high water temperature of the engine.

2. Pay attention to cleaning up the dirt inside the water tank.

3. Pay attention to check whether the water pump is working normally, the water pump is the power source of coolant circulation, if the water pump is damaged, the coolant can not be circulated for heat dissipation, resulting in high water temperature. Don't turn off the engine immediately when the water temperature is too high, for most models, the water pump of the cooling system is driven by the engine.

After the ignition is turned off, the water pump will stop at the same time, and the coolant can not continue to circulate, and all parts of the engine are maintained at a high temperature at this time, and if it is not effectively cooled, the engine may be damaged.

This mainly depends on whether the water temperature gauge shows that the water temperature is high, if the water temperature is high, it means that there is gas in the water tank and it is not discharged. Just deflate it. The water temperature gauge shows that the water temperature is not high, that is, the water tank lid is not well sealed, resulting in water leakage.

Just change the tank cover.

Precautions: Coolant flows inside the radiator core and air passes through outside the radiator. The hot coolant cools down as it dissipates heat to the air, and the cold air heats up by absorbing the heat emitted by the coolant.

Use & Maintenance:

1. The radiator should not be in contact with any acid, alkali or other corrosive properties.

2. It is recommended to use soft water, and hard water needs to be softened before use to avoid internal blockage of the radiator and the generation of scale.

3. Use antifreeze, in order to avoid the corrosion of the radiator, be sure to use a long-term antifreeze produced by regular manufacturers and in line with national standards.

This is a circuit fault, which may be a faulty water temperature control switch that controls the fan or a faulty ECU control ECU. (Early vehicles generally had two or three water temperature sensors, which controlled fans, meters, etc.)

And why it rotates after turning off is probably related to the design of the vehicle. Some vehicles will have the fan work for about a minute in order to better dissipate the heat of the engine after the engine is turned off. If the control of the fan is not controlled by the computer at start-up, it should be that the water temperature control switch (water temperature sensor) that controls the fan is faulty, and it can be judged by heating it and measuring the closure of the contacts.

This fault mainly needs to know the control mode of the car's fan control system in order to diagnose and eliminate.

If the temperature of the engine is very high, but the fan does not rotate, you can try to turn off the engine before ignition, or check the circuit inside the engine.

It may be because your engine has carbon deposits, and at this time, don't ignition and go to the car repair shop to repair the car.

In this case, you still need to lower the temperature of the engine first, and then check it, most likely because the internal structure inside has burned out.

The refrigeration fan of the trolley air conditioner does not rotate and will not increase the water temperature. If the water temperature cooling fan does not turn, the water temperature will definitely rise.

In general, there are three reasons: one is the lack of coolant, the second is that the coolant cannot be circulated, and the third is that the heat of the coolant cannot be dissipated quickly.

High water temperature due to lack of coolant is the simplest, but it is also relatively common, no matter what the car, the coolant will always be lost over time. In this case, the problem can be eliminated by simply adding coolant above the lowest scale and the water temperature is high. Body.

The second is that the coolant can not be circulated, the most common is the damage of the thermostat, the inspection method is generally determined according to the temperature difference between the upper and lower water pipes, and the electronic thermostat can also be detected by computer to determine its fault.

The third point is that the heat of the coolant can not be dissipated quickly, the common fault is that the electronic fan is broken, or the plug of the electronic fan is broken, and it does not turn due to the lack of power, and there is also a reason that the surface of the water tank is too dirty.

1. Insufficient coolant.

2. The water temperature sensor is broken.

3. The thermal switch is broken.

Please go to a professional repair shop for inspection and repair!

Hope it helps,!

One is when the engine coolant is at a high temperature, and the other is when the air conditioning is turned on! If the water temperature is not higher than 90 degrees and the air conditioner is not turned on, it is normal for the fan not to turn, if the water tank has been boiled and the fan has not turned, it is likely that there is a problem with the fan's thermostat or relay, or it may be the fault of the fan itself! Check whether the fan control circuit is open and whether the connector is plugged in firmly.

The water temperature sensor is damaged, just replace it with a new one.

In general, the situation should be investigated from three aspects: oil, gas and the engine itself. The "oil" aspect is mainly plugging and leakage, while the "gas" aspect is mainly the air leakage of the intake and exhaust systems. When troubleshooting the engine itself, the supercharger is often a factor that cannot be ignored.

The reason for the high engine temperature is that the engine temperature is too high, this fault is a comprehensive fault, the engine temperature is high, the water temperature gauge is high, generally speaking, the engine cooling system is faulty, the engine cooling system fault mainly includes coolant leakage, coolant insufficiency, cooling fan failure, circulating water pump failure,

Feel the upper and lower pipes with your hands to see if there is any temperature. From this, you can determine whether the thermostat is broken. Look at the expansion pot to see if there is water inlet and whether there is pressure, and then see if the surface of the water tank is dirty.

If it's dirty, find a place to clean it up. Finally, see if the cylinder gasket is broken, if it's okay, see if the anti-kettle is bubbling when the temperature is high. Judge whether the cylinder is leaking and see how many degrees the water temperature gauge on the meter is.

There is no such thing as a water temperature gauge lying.