Why is the engine hot? Reasons for engine overheating

With the onset of summer, many car ownersthere is one of the most annoying problems - engine overheating. And from this neither the owners of domestic cars nor the owners of foreign cars are insured. In today's article, we'll look at why the engine is hot and how to fix this problem.

In what situations does overheating occur most often?

Especially often the cars begin to boil in traffic jams. After several dozen starts and stops, the pointer of the temperature indicator can jump to the maximum level even in a foreign car. It is clear that the engine is warming up at idle speed than at normal revs. Allow frequent boiling of the motor can not, as this can lead to a serious and expensive repair of ICE.

Why is this happening?

So, we often warm the engine. The reasons for this can be very diverse. One of the possible faults is the impeller of the water pump. It is this part of the pump that can not ensure the normal circulation of the liquid through the cooling system. When the engine is idling for a long time (for example, it costs in a traffic jam), the antifreeze stagnates in the block. As a result, the cooling liquid begins to boil, because of which the engine is heated. How can I solve this problem? The only way out is to purchase and install a new water pump.

Pump belt breakage

In the event that a water strap breakspump, the operating temperature of the engine will grow rapidly, since the cooling fluid has ceased to circulate in the system. You can determine this fault visually.

In the case if the water pump jammed, thiswill show a characteristic squeal of a belt slipping on a pulley. It is not possible to manually repair the pump. In this scenario, it is recommended to look for a tug and go to the nearest car repair shop.

Poor thermostat

In the heat, this element can also affectoverheating of the motor. If there is a malfunction of the thermostat, the motor starts to heat up longer, and on the way to constantly increase its operating temperature. Therefore, if the motor is heated at a speed, it is most likely that the cause lies in the thermostat. A poor-quality part can simply jam. As a result, the semi-open element is not able to provide normal heat exchange and coolant circulation at high speed. Exit from the situation is similar to the first case - the defective element is subject to replacement. By the way, many owners of domestic cars in summer simply take out the thermostat and drive without it. On such cars the engine is not heated during the hot season. But with the onset of autumn motorists again install this element in its place.

Note that the engine is not always warmed up because ofthermostat. Perhaps, the reason for this can be the lack of cooling fluid in the system (we'll talk about this a little later). Therefore, the thermostat is always tested for operability before being replaced.

You can do this without removing it from theunder the engine compartment. When the engine is running, the upper pipe (the one that goes to the cooling radiator) is cold or extremely hot (so that it can not be touched), accordingly, the part does not let liquid through it. The replacement of the thermostat itself is performed only when the engine is cold.

There is another way to diagnose the thermostat. He is in the use of a pot of water and a gas stove. When the liquid in the container is about to begin to boil, the thermostat in it should open for a few seconds.

If this did not happen even when the water boiled, then the device is in an inoperative state. Thermostats can not be repaired.

Candles and ignition system

The main symptom that indicates a malfunctioncandles, is the unstable operation of the engine "on the cold." Sometimes the motor throws, and when overclocking there is a noticeable drop in power. All this is displayed not only on the dynamics, but also at the operating temperature of the engine, which reaches a mark of 100 or more degrees Celsius. The reason for this is poor contact in the high-voltage ignition system, which prevents the operation of one of the cylinders. It also happens that the candle itself has developed its resource and requires replacement. In this case, there will be black carbon on its end.

If after this repair problems appearagain, perhaps, the reason is hidden in the cover of the breaker-distributor (there will be cracks on it). In extreme cases, a set of wires, a slider or a cap of the trambler is changed.

Why is the engine hot? Coolant leakage

If there is a leak in the system, thiswill certainly lead to overheating of the motor. Determine this fault is very simple. As soon as the temperature arrow approaches the red mark, turn on the stove. If from the nozzles there is cold air instead of hot, then there is not enough coolant in the system. It is because of this that the diesel engine and gasoline are heated by most of our motorists.

Continue driving with a semi-empty radiatorextremely dangerous. In the event of a coolant leak, stop the engine and inspect the engine compartment. Most often, the engine is heated because of leaks in the nozzles. Damaged pipes should be replaced or temporarily wrapped with electrical tape (until the first auto parts store). In this case, the cooling system tops up the antifreeze to the desired level.

Airlock

If the engine is warming up (VAZ or "Mercedes" - notso important) is stable every 1-2 hours, the reason for this can be the cooling of the cooling system. In this case, it is necessary to drive the front of the car to a slope (excellent trestle will be an overpass), open the lid of the tank and radiator and wait until after 10 minutes the air will not come out himself. This is the most effective way to eliminate air congestion in cars and SUVs.

Fan failure

The operation of the fan is directly related to itssensor. It is he who signals when the engine temperature rises sharply. If the fan stops working, most likely, the case is hidden in the sensor. The latter must be replaced in case of a malfunction. Also the fan turns on forcibly. For this it is sufficient to remove the terminal that goes to the sensor wire.

Heated radiator

One of the most probable reasons whythe motor is heated, is the presence of different deposits within the system. Dirt together with distilled water can get on the nozzles, but more often it "lurks" in the radiators' honeycombs.

In order to eliminate this malfunction,The system must either be purged or cleaned. The latter method is more effective, since in it, using abrasive chemistry, up to 99 percent of the deposits that have accumulated for years on the walls of the radiator are removed.

Internal cleaning by own hands

If you use instead of antifreezedistilled water, you should regularly clean the internal parts of the system from the adhered scale. This is done with the help of special tools that can be bought at any hardware store. They are simply called: "descaler". Also they can be found in car shops or made by themselves. In the latter case, we will need caustic soda and several liters of warm (preferably hot) water. This mixture is diluted in the following proportions: 1 liter of liquid - 25 grams of soda.

The substance is poured into the radiator15-20 minutes. At this time, you need to let the engine run at idle speed, so that the product scales from the entire cooling system. It is important not to overexpose the mixture inside the system. After 20 minutes of being in SOD, aggressive "chemistry" will begin to corrode not only the scum, but also the thin walls of the radiator itself. As a rule, after washing, this mixture becomes rusty. This indicates that there was a large amount of dirt and deposits inside the engine cooling system. After use, it is not recommended to pour such liquid onto the garden - move it to a container and pour it out as far as possible from residential buildings. And one more thing: when working with such a means, you should use rubber gloves and try not to inhale the vapors of this mixture. They are very dangerous for the human body.

External cleaning

It happens that after cleaning in the carthe motor is heated again. "GAZel" and other domestic cars in this case should be subjected to blowing the walls of the radiator. The essence of this method is to remove various deposits that have accumulated on the outer part of the element. It can be gnats, poplar fluff and other debris, which prevented normal heat transfer of the radiator with the external environment. Purge or flush the part walls by hand, using a vacuum cleaner or hoses. But it is best that the debris is cleared under great pressure. At the same time, remember that radiator honeycombs are very fragile and thin, so blowing is done from the back side of the radiator. Those small parts that can not be cleaned with a hose or vacuum cleaner are cleaned manually with a thin sewing needle, nail and other small tools.

As practice shows, after external andinternal cleaning of the system, most motorists no longer ask questions about why the engine is warming up, and how to prevent the boiling of antifreeze. Moreover, this method is effective not only on domestic, but also on imported cars.

How to behave if the engine is warming up quickly?

When you notice that the temperature arrow is smoothly entering the red scale, immediately turn the stove on to maximum power and press against the roadside.

If after 1-2 minutes the needle does not fall tonormal level, you should muffle the engine and open the hood. Do nothing more - just wait until the engine cools down. Categorically you can not pour cold water on an overheated motor! In this case, microcracks form on the wall of the block head, which will lead to expensive repair of the car.

After 15 minutes, carefully unscrew the valveradiator. At this time, hot fumes can get to the surface of your hands and trigger a burn, so do this when you have clothes with long arms. Once the water and vapors have gone to one side, gently add the missing coolant to the radiator.

For greater effect, you must force the fan, which will supply cold air to the engine, thereby cooling it (how to do this, we told in the middle of the article).

It is necessary to continue to move on very carefully. To go follows with the included heater of the cabin at a speed of no more than 50 kilometers per hour. This speed is quite enough for the counterflow to blow the radiator, and the load on the motor will not be so great.

note

If you need to unscrewcover the expansion tank, remember that with a boiling motor do not do this. Modern cars are equipped with motors with operating temperatures up to 100 degrees Celsius, while their SOD is constantly operating under pressure. And as it is heated during heating, the antifreeze has the property of expanding, along with the air, it pushes the cork outward with incredible force.

The effect will be similar to flying a cork from underchampagne. Therefore, during operation, never unscrew it when the engine is warm, and only close it halfway to allow excess air to escape from the system. Plus, the lid is hot, so that a burn with improper handling is inevitable.

Conclusion

So, we found out the reasons why it gets warmengine, and also talked about ways to eliminate them. Finally give a little advice. Since it is very difficult to determine the motor overheating while on the driver's seat, you should develop a habit of sticking with it - after a short period of time, look at the arrow of the engine temperature. So you can always notice the problem on time and prevent expensive repair of ICE.

</ p>