Car engine always overheats, what causes car engine overheating? How to solve it?

The common causes of engine overheating are:

Engine overheating is mainly caused by insufficient cooling water, poor radiator cover and thermostat, loose or broken fan belt, blocked cooling water and insufficient oil in the lubricating oil system.

The temperature control switch is out of control or fails, the relay and circuit are in poor contact, the fuse is broken, and the ignition time is too late.

The water pump is not working well, the fan belt is loose or there is oil stain and it slips, the coolant is insufficient or leaking, and the silicone oil clutch is short of oil.

The distance between the fan and the water tank is not adjusted properly or the angle is wrong, the thermostat fails or is reversed, and the shutter is not opened properly.

Fouling of the water jacket, dirt on the outer surface of the radiator or excessive sediment inside, delamination and blockage of the inlet and outlet water hoses.

The phase of the orchestrator is incorrect, the mixing gas is too thick or too thin, the fuel model does not match, the combustion chamber has too much carbon deposit, and the muffler is blocked. Excessive load, insufficient oil or poor circulation.

Engine overheating is a common fault, which will lead to a decrease in engine power and economy, and in serious cases, it will also damage the parts, so such faults should be eliminated in time. The following takes the Santana sedan as an example to introduce the "four-step method" to eliminate the fault of excessive engine temperature. If you find that the temperature is too high or the temperature indicator light keeps flashing, you should stop and check to see whether the cooling water of the water tank is normal, and whether there is leakage at the water tank, water pipe and various joints.

If no abnormalities are found through the external inspection, you can make up the cooling water according to the regulations before continuing to drive. If the temperature is still too high after driving a certain distance, and the cooling water is found to have decreased a lot, this is most likely due to the sand hole or perforation of the water jacket of the cylinder block. Once this fault is discovered, it should be repaired and should not be taken lightly.

When the engine temperature is too high, you can use your hands to touch the temperature of the upper water pipe and the underwater pipe to determine the fault. If the temperature difference between the two water pipes is very large, it can be judged that the thermostat is not working. If you can't buy accessories on the way, you can remove the thermostat for emergency and replace it immediately after returning to the unit.

If there is air in the cooling system, it will form air resistance, which will cause poor circulation of cooling water and cause the engine temperature to be too high. The following methods can be used to deflate: let the engine run at high speed, gently unscrew the water tank cover until the gas is just released, at this time some cooling water will flow out with the gas, and so on many times until you feel that the gas is exhausted (at this time, the temperature of the upper and lower pipes will be significantly different when you touch it with your hands).

After troubleshooting, the cooling water should be replenished in time. If the four-stroke vehicle is driving on dirt roads or muddy roads for a long time, there will be some dirt adhering to the radiator, which will affect the heat dissipation effect over time, resulting in high water temperature. The radiator grille can be blown with compressed air and then rinsed with a water hose.

The hand of the water temperature gauge is always rising.

The following phenomena can be considered to be engine overheating.

When the pointer of the water thermometer enters the red danger zone, the power of the engine decreases.

Water vapor will come out of the gap in the hood Countermeasures: Drive the car safely off the road and park in a safe place, set the transmission in "P" mode and apply the parking brake, turn on the hazard warning lights, and turn it off if the air conditioner is in use.

If there is water vapor coming out of the gap in the engine cover, the engine cover should be opened to keep the engine running.

Confirm that the radiator fan is working properly.

When the water thermometer hand is lowered, turn off the engine.

After the engine has cooled down, open the water tank lid and check the amount of cooling water in the radiator and liquid reservoir, and whether the radiator part is dirty and dirty.

If there is not enough cooling water, replenish the radiator and reservoir. If cooling water is not available, water should be replenished as an emergency.

Go to a professional auto repair shop to check whether the thermostat, water pump, electronic fan, water tank fins and water pipes are broken.

Weakly asked, did you add water?

1. Poor heat dissipation of the engine and air conditioning system, resulting in high water temperature, the following fault phenomena will occur (applicable to FAW-Volkswagen and SAIC models):

1. When the traffic is not smooth and the traffic jam is blocked or idling for a long time, the engine water temperature gauge is too high, the working time of the electronic fan is too long, the engine noise increases, and the fault is most obvious when the air conditioner is turned on in high temperatures;

2. When the air conditioner is turned on in high temperatures, the idle speed is unstable and the speed floats too much, the rapid acceleration is weak, and the engine has abnormal noise;

3. After the hot car is turned off for more than ten minutes, it is not good to start the car, and sometimes the hot car will automatically turn off when driving;

4. The refrigeration temperature of the air conditioner is very cool when the car is cold, and the refrigeration effect of the air conditioner is not good when the car is hot, and there is a large resonance hum sound in the air conditioning system;

5. When the hot car is idling, the clutch of the air conditioning compressor is frequently sucked off or even disconnected, resulting in the air conditioner of the hot car not being refrigerated.

Second, there are several ways to solve the fault:

1. Check whether there is too much dust between the condenser and the water tank, and clean it thoroughly with high-pressure gas to ensure that the water tank and the condenser have good heat dissipation performance;

2. When the car is hot, check that the temperature difference between the upper and lower water pipes of the water tank is not too large, otherwise it is necessary to check the opening of the thermostat and whether the water pump has a fault of speed loss;

3. After the car is warmed, check the water return pipe at the upper end of the antifreeze water storage tank, if the water return is not smooth or blocked, the water temperature will be too high, and the Jetta car has too many faults. Please pay attention to it, and do not blindly disassemble and replace parts in maintenance;

4. Due to the non-standard addition and replacement of antifreeze, it will cause the engine waterway and water tank to be blocked in advance, and the water temperature will be high. Antifreeze is changed every two years, and original parts must be used when replacing and adding. Please note:

After adding water to the engine cooling system, or adding antifreeze concentration of more than 60, it will cause the water temperature to be too high;

5. Due to the high pressure at the high end of the air conditioning system, the pressure is too high; Excessive filling of air conditioning refrigerant or air conditioning refrigeration lubricant; The self-adjusting function of the internal self-debugging air-conditioning compressor fails, resulting in high pressure; There is also the blockage of the air conditioning condenser, which will increase the load of the engine, consume the heat dissipation performance of the cooling system, and lead to the fault phenomenon of excessive water temperature; Remind friends: too little or too much refrigerant filling in the air conditioner will reduce the refrigeration effect.

Engine overheating causes certain damage to the engine, and turning on the air conditioner when using the car in summer further aggravates the working load of the engine, causing the temperature to rise sharply. Six possible proto-Factors for a car engine to overheat:

Clause. First, the fan problem.

The fan motor does not move or the fan clutch is faulty, and the temperature cannot be cooled properly.

Clause. Second, exhaust problems.

The three-way catalytic converter is clogged or the tube is ruptured, causing the exhaust to be blocked, causing the engine to overheat.

Clause. 3. Coolant leakage.

If the pipe of the cooling system is broken, the coolant will be lost and the heat dissipation will not operate normally; This situation can be improved by simply changing the new pipe.

Clause. Fourth, the problem of water pumps.

The long-term use of the water pump after a high degree of wear, the parts wear out and fall off; The only solution is to replace the pump with a new one.

Clause. Fifth, the radiator cover problem.

If the pressure of the radiator cover is not the same, the spring will loosen and the cover will not be able to accommodate and close.

Clause. Sixth, the problem of thermostat blockage.

Thermostats that do not switch on and off properly are usually caused by mechanical failures or incomplete filling of the cooling system. The temperature coefficient of the newer thermostat is different from the original one, which is the cause of failure.

Check that there is a lot less antifreeze to see if there is a problem with the thermostat and whether the fan is rotating.

Check the fan, whether it is broken, whether the water in the tank is there, the easiest way.

The engine works under the rated load, and its cooling water can not be maintained at a normal working temperature of about 90 and boils, resulting in a large amount of cooling water spraying out of the radiator, so that the engine can not work normally, and this condition of the engine is called overheating. When the engine is running, if the coolant temperature gauge pointer points to the high temperature range (above 90) for a long time, and the coolant boils (commonly known as "boiling"), the engine is overheated. Engine overheating can be divided into sudden overheating during operation and frequent overheating.

Engine overheating is particularly prominent in areas with high summer temperatures, which can lead to weak engine operation or even damage.

What to do if the engine overheats? Analysis and troubleshooting of the causes of engine overheating.

The engine suddenly overheated.

Sudden overheating in engine operation is generally caused by broken fan transmission belt or fan circuit failure, water pump shaft and impeller disengagement, thermostat main valve falling off or serious coolant leakage.

The engine often overheats.

Overheating often occurs in engine work, and the reasons can be summarized into two aspects, one is the insufficient cooling intensity of the cooling system, and the other is the excessive heat transfer loss of the engine.

It is not difficult to analyze the composition of the cooling system and the function of each part to conclude that the reasons for the decrease in cooling intensity are: lack of coolant, slippage of the fan transmission belt, improper adjustment of the angle of the fan blades, blockage of the radiator or excessive dumping of the heat sink, poor coolant circulation due to thermostat failure or water pump failure, and serious fouling of the water jacket. If the engine is overheating, the above possible causes should be investigated first.

If the engine is overheated, but the cooling system is not faulty, it may be caused by excessive heat transfer loss of the engine, which may be caused by late ignition, too thin or too concentrated mixture, too much carbon deposit in the combustion chamber, insufficient lubricating oil, etc.; Excessive heat transfer loss of the engine is usually accompanied by abnormal phenomena such as insufficient power, high fuel consumption, backfire of the intake pipe, discharge of the exhaust pipe, and deflagration, which can be used as the basis for determining the scope of fault diagnosis. In addition, the engine can overheat due to downwind driving or driving at low speed and heavy load for a long time during the hot season.

Summary of the reasons why car engines are hot:

1. The fan motor does not move or the fan clutch is faulty, and it cannot be cooled down normally;

2. The three-way catalytic converter is blocked or the pipe is ruptured, resulting in obstruction of exhaust;

3. The pipe of the cooling system is ruptured, resulting in the loss of coolant and the heat dissipation cannot operate normally;

4. After the long-term use of the water pump is highly worn, the parts are worn out and fall off;

5. The pressure of the cover of the radiator is unstable, which will cause the spring to loosen and the cover cannot be closed tightly.

The solution to the car engine is hot is:

1. You need to turn off the air conditioner and drive the car to a safe area to park;

2. Idle the engine for a few minutes until the water temperature gauge pointer returns to the position between H and C;

3. Check whether the belt and pulley of the pump are damaged or slipped;

4. Whether there is leakage in the coolant level.

The high temperature you said is that the fender is very hot, and you have a wrong understanding of the high temperature of the engine. After the engine starts, the temperature of the combustion chamber is thousands of degrees, in just a few minutes, the combustion chamber burns I don't know how many times, such a high temperature, and then the front compartment is relatively closed, and it is certain that the lower canopy fender will be heated. To see if the engine is hot, just look at the water temperature display on the meter

What's wrong with a car engine overheating? If the car engine is overheating, it means that you have been running a long distance and for too long.

High engine temperatures are undoubtedly caused by a failure of the cooling system or an engine temperature that exceeds the efficiency of the cooling system, but there are many reasons for an overloaded engine temperature in addition to a failure of the cooling system.

The heat dissipation is not good, or the antifreeze is missing, and the cooling fan is not working!

You can go to the repair shop and check it out.

Overheating of a car engine may be caused by insufficient coolant, leaking water in the water tank, failure of the cooling fan, failure of the thermostat, etc., as follows: Insufficient coolant: The long water circulation of the engine will cause the coolant to lose slowly in the engine cooling system, resulting in a lack of water in the water tank.

If the owner does not check and add coolant in time, it can easily lead to engine overheating. Tank leakage: Broken or poor tank connections can cause water leakage and hinder water circulation.

Cooling Fan Failure: Damaged cooling fan or short circuit in wires may cause the fan to work or the cooling fan to slow down, resulting in engine heat being unable to dissipate and the natural engine temperature rising. Thermostat failure:

A thermostat is a device that controls the flow path of coolant. Once it gets stuck or fails, the size and circulation of the engine will be affected, and the heat of the engine will not be effectively dissipated.

The causes of overheating of a car engine are:

1. There is a fault in the cooling system, resulting in poor heat dissipation capacity;

2. The failure of the engine itself causes the delayed combustion of the work cycle, so that the cooling system is unable to dissipate the heat generated in time;

3. There is too much scale deposition on the outer wall of the cylinder liner, and the heat generated by the cylinder cannot be transmitted to the cooling water in time;

4. The radiator hose is leaking or the coolant level in the liquid storage tank is too low.

Workarounds for overheating of the car engine:

1. Stop the engine and idle it for a period of time;

2. Open the front engine cover or lift the seat to ventilate the engine;

3. Add coolant to the radiator and liquid storage tank;

4. Check the working condition of the fan motor and repair or replace it in time.

A red light is an engine failure alarm, not an overheating alarm. Just start, there are 4 liters of oil and 8 liters of antifreeze outside the cylinder to protect you, boiling the 12 liters of liquid may overheat the engine, 12 liters of burning to 100 degrees is not a few minutes to start for a while.