Radiator (water tank) “boiling” It is the most common cooling system fault, which means that the cooling water in the engine water tank reaches the boiling point and generates a large number of bubbles. If a part of the area of the circulating system is occupied by bubbles, it will cause serious water loss around the cylinder wall. Although there is cooling water in the water tank, there is not enough water around the cylinder wall to dissipate heat, which greatly reduces the heat exchange efficiency, The heat in the cylinder cannot be brought to the water tank for heat dissipation.
If the excessive heat is not dissipated in time and the driving is still under high load, the strength of piston, piston ring, connecting rod and other components will be reduced or even deformed, which can not bear the normal load. At the same time, the normal clearance between parts will be damaged, so that the normal oil film can not be maintained between parts. If it is light, the engine will pull cylinder and pad, If it is serious, the whole engine will be damaged or even scrapped.
On the truck Home Forum, I saw many card friends posting that they had encountered the situation of water tank boiling, and others said they had been deeply hurt by water tank boiling, which damaged their car. Once the water tank boils, what measures should be taken to minimize it?
When the water tank boils, whether it is boiling at low speed or high speed, it needs to run at idle speed for a while, and open the engine compartment cover to facilitate its heat dissipation.
When the engine is running at a high load and high speed for a period of time, if the water tank boils, you can’t stop and shut down immediately. Instead, you should pull over and idle for a period of time before shutting down. Because the engine was running at high speed before, the engine generated a lot of heat and needed residual cooling water to dissipate it. The cooling water in the radiator is driven by the water pump, and the water pump runs coaxially with the crankshaft of the engine. When the engine stops running, the water pump does not work, and the cooling water in the radiator cannot be recycled. If the boiler is turned off quickly after boiling, the waste heat will produce a very high temperature and deform and damage the parts.
After the vehicle is parked properly, on the one hand, you can call for assistance. At the same time, you can first check what causes the “high fever” of your car. If conditions permit, you can take some measures to help the vehicle cool down. The causes of “fever” are different, and the treatment methods are also different. Let’s follow Xiaobian to see how to deal with truck fever caused by different reasons.
First, check the antifreeze allowance of the water tank to see if there is water loss. If water loss is found, add antifreeze immediately. Drivers with strong hands-on ability can also consider replenishing water to the cooling system by themselves. It should be noted here that it is best to add antifreeze. If there is no antifreeze, purified water can be used for emergency. In addition, when replenishing water, do not open the water tank cover immediately, because the water temperature in the water tank is very high and the pressure is very high. Opening it immediately is likely to cause high-temperature steam ejection and scald. It’s best to wait for a period of time before opening. When opening the water tank cover, it’s best to pad a towel to prevent water vapor from scalding your arm.
When the water temperature in the water tank is still very high, do not add ice water, because if there is too much lack of cooling water, the added ice water may flow into the cylinder liner of the engine along the pipeline to quickly cool the engine with a temperature of more than 100 degrees. This thermal expansion and contraction will destroy the normal clearance between parts in the engine, accelerate the wear between parts and damage the engine. If possible, you can heat water. If there is no hot water, it doesn’t matter. Add cold water when the cooling water in the water tank cools down.
In case of water tank leakage or other pipeline leakage, emergency driving can be carried out after adding antifreeze or purified water. It shall be repaired in time when arriving at the maintenance shop. If the situation is serious, call for rescue.
Too much scale will affect the water circulation and heat dissipation efficiency, and will also lead to the boiling of the water tank. Because the water tank has not been cleaned for too long or regular antifreeze has not been used, the scale precipitation is too thick, blocking the water tank, resulting in poor water circulation and boiling. In addition, the thermal conductivity of scale is very small, which is 1 / 25 of cast iron and 1 / 50 of brass, which is equivalent to forming a fatal thermal insulation layer in the engine cooling system.
When the water tank boils due to scale, professional technicians are required to clean the scale of the water tank, and the water tank needs to be replaced if necessary.
The full name of antifreeze should be antifreeze coolant, which means coolant with antifreeze function. Antifreeze can prevent the coolant from freezing and cracking the radiator and freezing the engine cylinder block in cold seasons. Used as coolant in the cooling system. It has many functions, such as anti freezing, anti boiling, anti-corrosion, waterproof scale and so on. Like water, it has the advantages of large specific heat, high evaporation potential heat and convenient supplement.
Only using pure water or tap water as coolant will also cause the water tank to boil. In addition, it will cause greater damage to the vehicle. The main mineral in the water medium, calcium magnesium ions, are finally formed on the cylinder block, cylinder head, engine water channel and inner wall surface to form a hard shell of calcium carbonate and magnesium carbonate, which is scale, resulting in high temperature, local overheating and difficult troubleshooting of the engine.
Modern high-performance diesel engines absolutely prohibit the cooling system from adding water, and irreversible damage will occur after 100 hours of operation. Different brands of coolants cannot be mixed, even those with similar coolant components, so as to avoid the reaction of antifreeze with different components, resulting in precipitation and blockage.
When the vehicle is running, the heat sink is covered and blocked by sundries such as oil sludge and leaves, which will reduce the heat exchange capacity of the inlet air and cause high water temperature. For example, when spring comes, some sections of Yang Xu fly all over the sky. If a large number of Yang Xu is covered on the heat sink, it is equivalent to covering it with a quilt, and the heat dissipation effect will be greatly reduced. In such cases, blow with compressed air or flush with low-pressure water flow from behind the radiator after the engine is shut down to remove sundries, and then clean the core with a soft brush. Do not flush with a high-pressure water gun to prevent damage to the radiator.
If the heat sink is stacked or bonded together due to mechanical damage and other reasons, the air flow cannot pass through the radiator core smoothly, resulting in poor heat dissipation. The solution is to carefully move the heat sink to the original position, restore the flat shape of the heat sink, and completely remove or directly replace it if necessary.
In another case, the thermostat is damaged. The coolant cannot be cooled in a large cycle through the water tank and has been circulating in a small cycle. The coolant temperature rises rapidly, resulting in high engine temperature. In this case, the driver with certain hands-on ability can remove the thermostat to make the vehicle enter the large cycle heat dissipation mode to cope with low load driving. It is best to stop immediately and seek professional treatment.
If the boiling is caused by water loss or dirty radiator, the large circulation is turned on. You can pour water on the radiator to cool the radiator. It should be noted that water should be poured on the radiator of the engine water tank instead of on the engine, because the surface temperature of the engine is very high at this time. If cold water is suddenly poured on it, the relevant parts of the engine surface will be deformed due to local cooling. At the same time, there are many sensors on the engine, and water pouring will cause water inflow and short circuit of electrical components.
In addition, some extreme driving environments will also boil the water tank at that time. For example, when driving on a long-distance uphill road under heavy load, the engine has been running at high load, generating too much heat, which will also lead to boiling. Especially in the summer with high temperature, the heat dissipation efficiency decreases, and the boiler also boils under high load operation.
Running on the road when the water tank is boiling, it will affect the driving and transportation, and it will be overhauled if you love the car. If you pay attention to the frequent maintenance and inspection of your car, you can greatly reduce the probability of boiling the water tank.
The first is to choose a regular antifreeze. Don’t think it’s only effective in winter. It’s also very important for the heat dissipation system. Check the antifreeze allowance frequently, and check the water tank and water pipe for leakage. At ordinary times, antifreeze of the same brand and specification is also stored with the vehicle to deal with normal loss or even leakage.
Check whether the engine water pump belt is loose or damaged. The water pump tensioner is loose, resulting in too loose belt, slow water pump speed, small water flow and high water temperature. Adjust the belt tension; Check whether the induced draft hood and air protection belt are damaged. If damaged, the air volume passing through the cooling water tank will be reduced, resulting in too high water temperature, which must be replaced or repaired.
Check whether the cooling fins of the cooling water tank are covered by foreign matters. If they are covered, clean them in time, and install insect screen to filter foreign matters; Check the integrity of the heat sink and repair or replace it according to the damage.
Check whether the thermostat works normally and ensure that the water tank can carry out “large circulation”. When the engine is running cold, if coolant flows out of the water tank water supply pipe, it indicates that the thermostat valve cannot be closed; When the coolant temperature exceeds 70 ℃, and there is no cooling water flowing out of the water tank, it indicates that the thermostat cannot be opened normally.
There are many and complex reasons for the boiling of the water tank. It is more important for drivers to check their cars on weekdays, master more car knowledge, drive reasonably on the way, observe the instruments frequently, find and deal with them early, and take precautions.
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