The correct operation of the car's cooling system determines the quality of the car's engine. The use of an optimally selected antifreeze solution eliminates the possibility of engine overheating. Over time, the channels of the system begin to clog. As a result, the operation of the internal combustion engine may be disrupted. How to flush the cooling system (CO) and what methods can be used for this, learn from this article.
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Why and when do you need to flush the vehicle cooling system?
Flushing the cooling system of the internal combustion engine must be performed in case of clogging. CO includes a number of components that must work properly and interact with each other. This will allow the antifreeze to cool the hottest parts of the power unit. The most vulnerable component of the cooling system is the pipes. Over time, they become clogged and destroyed as a result of exposure to high loads.
During use of the machine, sand, rubble, stones from the road, and insects can get into the engine compartment, which leads to the formation of dirt on the unit. As a result, some of the contaminants appear in CO and mix with the consumable. This contributes to the formation of scale on the metal components of the system, which eventually flake off and get into the pipes. As a result, the lines begin to clog, and this contributes to a decrease in the efficiency of the CO, in some cases, its complete failure is possible.
Dirty CO radiator Limescale on the radiator Deposits in CO CO pipes before and after cleaning
Proper flushing will effectively remove contaminants from the lines. You can find out about the need for cleaning by the appearance of the antifreeze indicator on the control panel. If the light comes on, this may indicate not only the absence of consumables, but also the presence of problems in the operation of the CO. Experts recommend flushing the flushing process at least every two years.
Determination of the degree of clogging
There are several ways to determine the degree of CO contamination:
- Engine inspection. Its overheating can be associated with various reasons, but the lack of cooling of the power unit is one of the main ones. If the engine constantly overheats, you need to run a cooling system diagnosis.
- Checking the expansion tank. The degree of clogging can be determined by the presence of sediment in the tank. But for this, the container will have to be dismantled. It is unlikely that it will be possible to determine the presence of deposits on the reservoir installed under the hood. You can try shining a flashlight on the container. If a layer of deposits is visible at the bottom, then it is time to flush with CO.
- Monitoring the state of the coolant. The presence of rust and traces of scale in the coolant indicates the need to replace the refrigerant and purge CO.
- Inspection of hoses. Clogged connections can be identified by disconnecting one of the hoses. Be careful as refrigerant will start to escape from the line when disconnected. If you see a blockage inside the tube preventing the consumable from flowing through the system correctly, then flush it.
Flushing methods
To clean the cooling system, you can use the services of specialists at the workshop. But there is nothing difficult in this procedure, so we suggest you learn how to complete such a task yourself. Effective flushing can be performed using either special fluids or with improvised means. Below we will tell you about how you can flush CO at home.
Using water
Water is not the best tool, but the most affordable option for car owners. But for rinsing, you should not use an ordinary liquid, but a distillate. The fact is that the composition of tap water may contain molecules and substances that aggressively affect the rubber elements of CO. If some of the liquid settles in the system, it will destroy the rubber components.
The distillate cleaning process is relevant for all cars, be it Daewoo Sense or Mercedes, and it is performed as follows:
- We cool the engine. The procedure is performed on a cold engine, so wait for the internal combustion engine to cool down.
- We remove the used material. To get rid of the old antifreeze, you need to unscrew the plug and wait until the consumable is completely out of the system. Do not forget to install a container under the drain hole to collect the drained liquid.
- We fill it with water. We twist the plug and pour distilled water into the CO using an expansion tank. The volume of water must correspond to the volume of the coolant drained from the system.
- Flushing process. We start the engine, let it run for a while. You can even travel a little. It is desirable that the engine run for about 15-25 minutes.
- We drain the water. If it is too dirty and there are traces of deposits and scale in it, then it is advisable to repeat the cleaning procedure. When clean water comes out of the system, it will become clear that the result has been achieved. You can now fill in new antifreeze.
Advantages and disadvantages
The main advantage of this method is its availability and low cost. Finding a distillate is not a problem. The disadvantage of this method is that its implementation is more relevant for preventive purposes, when the level of contamination is low.
Artem Petrov provided detailed instructions on CO purification.
Use of acids
CO can be washed with citric or phosphoric acid solution. This option is especially relevant for those car owners who want to clean the system from sealant or oil residues. The cleaning procedure is carried out in the same way as with water.
To accomplish the task of removing contamination with kilotes, the following nuances must be considered:
- Proportions. To make a solution for cleaning a highly contaminated system, you will need 1 kg of acid and 10 liters of water. For moderate contamination, the volume of acid can be reduced to 800 grams per 10 liters of liquid.
Technical features. The procedure is carried out in the same way as for rinsing with water. After pouring the solution into CO, you need to drive a car for some time. Let the motor run at both idle and load conditions. After driving, stop the engine and leave the car with the acid filled with CO for 45 minutes.
Thorough rinsing. After draining the solution, flush with CO with regular distillate. To do this, repeat the cleaning procedure 3-4 times.
Advantages and disadvantages
For flushing with this method, you will have to spend money. In addition to 20 liters of distilled water, you will need to buy citric acid. The average cost of one kilogram is $ 1-2. Note: if you overdo it with proportions, then the acid can corrode the pipes and gaskets.
Using vinegar
With your own hands, you can clean the system using vinegar. It is important to observe the proportions here: half a liter of vinegar is added to 10 liters of distillate. Cleaning consists in pouring the solution into CO, further warming up the power unit to 100 degrees and stopping it. After that, the machine is left for about 8-10 hours. When draining the liquid, pay attention to its condition. If there are traces of rust and scale, as well as dirt in it, the procedure is repeated. When the cleaning is completed, the unit is flushed with distillate.
The CO flushing procedure with vinegar is shown in the video filmed by the "Little bit of everything" channel.
Advantages and disadvantages
The advantage is the low cost. Vinegar is cheap, so you don't have to spend a lot on this flush. The main disadvantage is that this process takes a long time. If the engine contamination is severe, it will take several days to clean.
Caustic soda
The use of this option is relevant for cleaning the radiator device and heater. The use of soda is allowed only on parts made of brass or copper. If your car is equipped with an aluminum radiator, then the use of caustic is not allowed. This product can also be used to clean the jacket of the cooling system. When performing this method, observe the proportions: pour about 50 grams of soda into one liter of distillate. The radiator must be dismantled before cleaning.
Advantages and disadvantages
The positive properties include its significant cleansing effect. Caustic soda is a powerful substance that almost no pollution can resist. The price is quite low, which is also an advantage. The main disadvantage is that the substance is unsafe. When working with it, you must follow the precautions throughout the cleaning procedure.
Milk serum
This tool is characterized by the presence in its composition of elements, the chemical characteristics of which allow dissolving deposits and scale, while not affecting negatively the rubberized components of the cooling system. Before pouring the whey into CO, strain it through a sieve. After the gulf of serum, you should drive about one thousand kilometers on it. After draining the fluid, the system must be flushed with distilled water and filled with antifreeze that meets the engine specifications.
The Dachny Master na Vse Ruki channel showed the result of washing the OS with serum.
Advantages and disadvantages
The main advantage of this method is its efficiency. The serum also cleans the lines of the cooling system and the radiator well, as well as specialized products. The disadvantage is that the cleaning process is very time consuming. If you urgently need to flush the system, then this method will not work. Also, its implementation is impossible in the cold season, since the serum will quickly freeze in the cold, and this can lead to more serious consequences. In addition, after filling, you will need to check its condition from time to time and be sure to monitor the operating temperature of the internal combustion engine.
Rinsing with Coca-Cola
As the reviews show, the use of Coca Cola is considered one of the most effective methods of fighting pollution. The product contains orthophosphoric acid, which quickly removes rust and scale. Be careful, as there is sugar in Kolya, and it clogs the system lines and the radiator device. The flushing process is carried out in the same way as with ordinary water. After using the drink, CO is cleaned again with distillate.
Advantages and disadvantages
The virtue lies in efficiency. But due to the acid content in the composition of the drink, there is a possibility of destruction of rubber components and CO pipes. Coca-Cola is a liquid product with gases. As a result of heating the motor to operating temperature, the gases will expand, and this can have a devastating effect on the operation of the motor. Before pouring the drink into the cooling system, we recommend unscrewing the cap and waiting for a few hours until the gases come out. Another disadvantage is the high cost.
Chemicals
For cleaning, you can use special flushing agents, for example, Hi-Gear or Liqui Moly. The range of such products is large. Mild flushing chemicals do not negatively affect the condition of the radiator and CO hoses, and it allows you to clean the system quickly enough.
There are several types of chemicals:
- Neutral. There are no aggressive molecules in the composition of substances. Such washes are not as effective as compared to other consumables; their use is more important for prevention.
- Alkaline. Reviews show that such products are good at removing organic pollution. You will not be able to find them on sale undiluted.
- Acidic. They are very aggressive towards the constituent components of the cooling system. Their operation is relevant for removing scale, as well as inorganic contamination.
- Two-component. These products contain alkali and acid. These products are sequentially poured into CO and allow efficient cleaning of CO from any type of dirt.
Advantages and disadvantages
The advantages include a huge selection of funds and their effectiveness. In practice, chemistry is always better at cleaning the cooling system than other fluids. Moreover, its application will allow you to quickly achieve results. The disadvantages include the high cost of funds.
In order to avoid problems in the work of CO, consider the following nuances:
- Do not use tap water for flushing.
- To create a solution, only the use of a distillate is allowed.
- Pour only high-quality consumables into the cooling system, do not skimp on buying antifreeze.
- Perform a visual inspection of the refrigerant periodically for deposits, dirt and scale, as well as traces of rust.
- Change the fluid in the system at least every 3 years or after 40-80 thousand kilometers.
- When replacing consumables, perform CO cleaning.
The radiator grill is a kind of dirt receptacle: everything that passes through it settles on the radiator. And there may be several radiators in a car - for a charge air cooler (intercooler), a power steering, an air conditioner condenser. The radiator of the engine cooling system is always installed last in the direction of the air flow, which means that it is the worst blown by the incoming air flow. And often it is because of him that they start water procedures. After all, other heat exchangers only partially lose efficiency when contaminated, and the engine cooling system looks more like a toggle switch with two positions: "works normally" and "guard, we are boiling!"
The engine radiator becomes dirty not only on the outside; rust and scale particles, as well as oxidation products of aluminum parts, often accumulate in its tanks. And if you are thinking about flushing the radiator from the outside, it makes sense to combine it with replacing the coolant. The timing of fluid replacement is different for all cars, but, believe experience, with a mileage of 80-90 thousand kilometers, it will not hurt to renew it.
Consider ways to clean radiators. We will act as the fathers of dialectics bequeathed, from simple to complex.
Easy peasy
The easiest way is with - they have one radiator. You can wash it yourself without even removing it from the car. For example, from a hose in the country. Or drove to the sink. The water pressure should not be powerful so that thin heat-dissipating plates do not bend. If this happens, the radiator will practically stop letting air through itself and, accordingly, will not be able to effectively cool the liquid.
Before water procedures, it is advisable to install a plastic film screen behind the radiator: it will block the path of water and dirt flying onto the drive belt, generator and candles. In this case, it is important not to flood the fan motor either. He is not afraid of splashes, but should not be directed directly at him with a jet of pressure.
In company
If the engine cooling radiator is installed in a package with other radiators, flushing it without dismantling it is unlikely to give the desired result. The fact is that the jet after washing the first heat exchanger inevitably loses its strength - and effective cleaning of the second radiator will not work. In this case, you can try to flush the radiators from different sides: the condenser from the outside, and the radiator of the cooling system from the inside. But I know from experience that sometimes there is something like a felt blanket made of poplar down and other "materials" between two heat exchangers. Sometimes it is possible to get rid of a little blood by dismantling the radiator grill (on those cars where it is removed separately from the bumper). This will make it possible to flush the heat exchangers without. And then, by tilting the engine cooling radiator and disconnecting its upper mounts, clear the space between the radiators.
The most difficult, but also the most effective way to clean an engine radiator is to completely remove it. To do this, you will have to disconnect and remove the electric fan assembly with a casing, as well as disconnect the engine and air conditioning heat exchangers. It is more difficult with the air conditioner condenser: after dismantling, you will have to recharge the system with refrigerant. Therefore, they try to simply take the condenser to the side and flush it, dispensing with depressurization of the air conditioning system. At the same time, I recommend cleaning the removed engine radiator not only outside, but also inside. For one hundred percent success, you need to drain the coolant from the system and flush all cooling circuits with clean water. This will increase the efficiency of the heater, since dirt accumulates in its heat exchanger.
The method for removing the cooling system radiator is different for different machines. In most cases, it is necessary to remove the front bumper and radiator grille, and also remove the engine guard or plastic mudguards from below. Some vehicles have a booster beam under the bumper that is welded to the front ends of the side members, making it difficult to access the radiators. For others, it can be removed by unscrewing just a few bolts, making it easier to access the heat exchangers.
If you do not dare to flush the radiator on your own, you can entrust this work to professionals. At the same time, the officials will act according to the full program - with the removal of the radiator, but they will also ask for a considerable amount. For example, the owner of a mid-size crossover in Moscow will have to pay about 12 thousand rubles.
Unofficial services that specialize in cars of the same brand usually rate their services somewhat lower. The offers of garage masters are even more affordable, but the quality is often appropriate. Washing the removed radiator at the car wash will cost 100-300 rubles.
Before you know how to clean the engine cooling system from rust, you need to understand the reasons for its formation.
The main problem of radiator contamination is the use of untreated water and improper maintenance of the cooling mechanism. As a result, scale forms in the radiator cells and pipelines, and rust occurs. Also, the composition of running water includes salts, which, under the influence of high temperatures, settle and destroy the inner part of the radiator pipes. Using distilled water will protect the mechanism from scale, but it will not be able to cope with the corrosion process.
The efficient operation of the cooling mechanism is ensured by the bay of high-quality antifreeze and antifreeze. In parallel with this, improperly diluted coolant and not timely replacement leads to a loss of the protective qualities of the additives and their precipitation. Decomposition products accumulate on the walls of the radiator and pipes, which leads to internal destruction of the channels.
Consequences of radiator contamination
It is recommended to check the technical condition of the cooling elements once every two years or after 70 - 80 thousand kilometers. In this case, you need to perform the following actions:
- clean the system elements from dust and dirt;
- visually inspect the parts and branch pipes of the unit for mechanical damage;
- replace the liquid in the radiator;
- flush if necessary.
How to flush the engine cooling system from rust can be found in the online store or service center.
Untimely technical work leads to premature failure of the cooling mechanism.
The formation of rust and scale on the radiator honeycomb and water circulation channels leads to the following consequences:
- overheating and jamming of the power unit;
- deterioration of the coolant heater;
- failure of the vehicle interior heater;
- damage to the water pump.
Therefore, for the smooth operation of the car, it is very important to know how to clean the engine cooling system from rust.
Self-cleaning methods
Cleaning is carried out in two stages.
- The first stage is external cleaning: the cooling radiator, fan and grill are washed from debris, dust, adhering dirt.
- At the second stage, internal cleaning is carried out using special means.
To understand how to clean the cooling system of any engine from rust, it is necessary to conduct a visual analysis of the drained fluid from the installation. Its color and the presence of foreign pollutants will tell you how to flush the mechanism. Dark color, greasy spots, rust particles indicate heavy contamination.
In this case, it is desirable to use an acidified solution. With a light shade without obvious precipitation, it is enough to use distilled water.
Rinsing with distilled water
The robot begins by draining the waste fluid. For this, the car is equipped with a valve on the radiator and a special bolt on the engine block. Next, you need to fill in distilled water and start the car. After 20 minutes of low speed operation, we turn off the engine and drain the water. By the state of the water, we determine the need for repeated flushing:
- if the water is clean, fill in the prepared antifreeze composition;
- in the presence of dirt, we flush the system again.
Lemon acid
It is used in case of corrosion ¸ severe contamination of radiator elements.
The effective action of the component begins after the engine warms up to 70 - 80 degrees. In order not to damage metal and rubber parts, the solution must be prepared in the following proportions:
- for every 5 liters of water, add 100 - 120 g. citric acid;
- 80 - 100 gr. - for 4 liters of water.
Application of the solution.
First you need to drain all the water from the radiator and cylinder block. After that, fill in the prepared solution, start the engine and warm it up to 80 degrees. The total time to complete the procedure should be within 30-40 minutes. The procedure ends with a complete drain of the solution and additional washing with distilled or boiled water. This is done to completely remove the residual solution.
Caustic soda rinsing
The method is suitable for copper radiators of the cooling mechanism. It is prohibited to use the method if there are installed aluminum parts.
How to use:
- 50 - 60 gr. soda is diluted in 1 liter of water;
- the dismantled radiator is washed with the mixture.
After work, the device must be rinsed with boiled water.
Auto chemicals
The advantage of using them is that they contain additives that drill effectively with the consequences of corrosion and do not harm the engine.
A reliable means of protecting the radiator from corrosion is an aqueous solution of ethylene glycol.
To ensure reliable protection against rust, it is necessary to take into account the values \u200b\u200bof the dependence of the percentage of ethylene glycol on the crystallization temperature of the coolant.
There is no ideal cleanliness system with liquid circulation. Any liquid begins to clog from the very first minutes of its operation. It's just that at first this process is not so noticeable, because the percentage of polluting particles is small. In this case, the automobile cooling system (CO) is not an exception. She also needs quality care.
Flushing the engine cooling system is more often carried out on vehicles with significant mileage. To control the purity of the liquid in CO, it is enough to periodically open the radiator cap on a cooled machine or look into the coolant tank. Such monitoring and maintenance will ensure high-quality removal of excess heat from the motor.
When the power plant of the car is operating, the cylinder block is heated due to friction and the process of fuel combustion. The cooling system is designed to remove excess heat energy from the unit. Constant circulation of liquid through the channels is ensured by the operation of the water pump.
Contaminated coolant
During operation, chemical reactions of the coolant with the material from which the cylinder block, radiator, and connecting pipes are made are inevitable.
This happens especially intensively when using ordinary water, and not special fluids such as antifreeze with anti-corrosion additives.
With constant circulation of dirt through the system, the passage channels are clogged, the pressure and load on the water pump increase. This contributes to its wear. Also, limescale and corrosion deposits on the walls of the system reduce the efficiency of heat dissipation, and the motor overheats. There is an intensive production of parts and whole units.
A simple replacement of antifreeze does not always lead to the desired result. This operation is not enough; drastic measures are required.
Flushing the car cooling system
Before you flush the engine cooling system yourself, you need to decide on a way to get rid of dirt. There are aggressive cleaning options, and there are milder methods, but someone uses a completely exotic one with the use of carbonated drinks. Each of these options is justified from the chemical and physical side of the process. However, it is recommended to engage in such cleansing with a frequency of about once every 2 years for cars with average mileage.
Distillate use
Draining the liquid from the cooling system is carried out only when the engine is cold. Before washing, you need to place the car on a flat surface, maybe with a slight slope. The front of the car in this case should be slightly higher than the back.
- Opening the lid on the expansion tank and on the radiator;
- Substitute the container to drain the liquid under the radiator and open the drain plug;
- We put the container under the block cylinders and open the drain plug for liquid on it;
- After completely draining close the bottom plugs;
- Disconnect the branch pipe from the carburetor motor with heating the carburetor, and the injection remove the hose from heating a throttle pipe to prevent airing of the cooling system;
- Fill in the distillate to the level specified for the car and close all plugs, returning the pipes to heating the fuel mixture.
After filling the system with distillate, you need to start the engine and let it idle for about half an hour. After that, the flushing fluid must be drained along with the dirt through the drain holes at the bottom of the unit and radiator.
Channels clogged with scale can be flushed with special products
This procedure is repeated several times. You can finish flushing after the time when clear liquid comes out of the system. This method is used as a gentle flushing option.
Acid wash application
Before flushing the engine cooling system with a more aggressive liquid, you need to make sure that there is a significant amount of scale in the coolant. Calcareous deposits in the system may not always be mechanically washed out by the distillate. Then you need to use a solution with acid. You can use table vinegar, caustic soda or household citric acid as a basis for it.
A high concentration of acid can adversely affect the rubber seals or plastic tubing of the system.
In a solution, you need to limit the acid to a maximum of 3% concentration, so as not to cause more damage to elements that react with such a liquid.
An exotic way to flush the cooling system
Washing is carried out according to the same algorithm as with the distillate. However, after turning off the motor the liquid should not be drained immediately, but after 2-5 hours... This will make it possible to dissolve scale or lag behind the walls in the system. After draining the acidic solution for the last time, you need to flush the channels with distillate to remove acid residues. After that, a gulf of pure antifreeze is allowed.
Application of "autochemistry"
In addition to the "popular" methods of flushing cooling, there are special chemical fluids that are offered by large manufacturing companies. They are based on special reagents that handle CO body elements and connecting hoses with care.
Use of auto chemistry
Their method of application is the same as for other washing methods. The dosage when entering the system and the operating time are indicated in the instructions for their use. After using them, it is also required rinse with distillate from residues of "chemistry".
Conclusion
Flushing the system helps not only cool the engine, but also the high-quality operation of the car stove. Liquid flows better through clean channels, heating the air in the cabin. To keep clogging of antifreeze to a minimum, it is necessary to fill in only high-quality liquid into the system proven firms.
It will contain a sufficient set of reagents to keep the system in working order for a long time. The driver must monitor the coolant level, regularly adding it through the expansion tank, and do not bring its volume to a critically low value. The system can install a special filter to clean the liquid from contamination.
Few car owners know how to flush the engine cooling system, although in this process it is necessary to take into account a whole lot of nuances.
Of course, some people do it on their own, without any theoretical knowledge. So you can only harm and disrupt the operation of the cooling system. Also, be sure to consider the question of what liquid can be used to flush the cooling system. Right now, you can find out about how the car cooling system is flushed and what fluids are used for this.
The engine is subjected to heavy loads during operation, and therefore it heats up to high temperatures. It turns out that the engine cooling system lowers its temperature. In this very system, a coolant circulating through special channels is involved. By its physical principle, it plays the role of a coolant, absorbing heat from the motor. The hot liquid is then cooled by a radiator, after which all the heat is dissipated in the airspace. In the event of an inoperative cooling system, the engine in your car will constantly overheat.
Why isn't it working?
There are a number of reasons why a car's cooling system is not working properly. It is possible that a plaque has formed in the radiator tubes and channels, which interferes with the heat transfer process. It is noteworthy that these precipitations practically do not conduct heat, so it remains inside the engine compartment, and the radiator will simply work idle.
In general, the plaque is something similar to scale, which is formed as a result of the ongoing oxidizing processes with the support of a rather high temperature.
Serum wash
You need to flush the cooling system with whey - this is one of the best ways. The fact is that the whey has an acidic environment, in which all scale and other plaque will quickly dissolve. But there are other reasons for the poor performance of the cooling system. For example, a so-called airlock can form in the channels. The liquid will not pass through the highways at all, therefore, in this case, it is simply impossible to avoid overheating of the engine.
Also, inoperability of the fan can cause poor performance of the cooling system, but this has nothing to do with the so-called channels. But a radiator clogged with dust and debris can also interfere with the proper operation of the cooling system. The heat exchange process is disrupted, heat is not removed from the engine compartment, respectively, the engine itself will heat up to critical temperatures. If you really have at least one of the above problems, then you definitely need to flush the cooling system
Flushing fluids
If the car is operated in harsh conditions, then the fluid for the cooling system can be changed once every two years.
However, it is worth remembering that before replacing it, you must first flush the system. How to flush the car cooling system? For this, special chemicals are commercially available. You can use ordinary distilled water as a flushing liquid only if the drained coolant does not have any residues, and also if its normal color is preserved. It is not recommended to use ordinary water for flushing, as it contains a large amount of salts that will accumulate on the main channels.
In general, you can flush the cooling system with almost any liquids that have a so-called acidic environment. It is in such conditions that any precipitation will be destroyed. For this, special chemicals are added to the water. It can even be regular vinegar. You can purchase specialty additives. Of course, the most effective are specialized fluids for flushing the cooling system, which can be purchased at any auto store.
Folk ways
Someone pours ordinary Fanta lemonade or milk whey into their system - all these products have an acidic environment, so any precipitation will instantly collapse. Citric acid is also one of the best options. In general, all of the above liquids and products are much more effective than chemical active substances that are sold in automobiles, therefore we suggest that you flush your coolant with either citric acid or milk whey. We assure you that you will not cause any harm to the car by this very action! However, remember that in this case, you will definitely need to re-flush the engine with distilled water, as some chemicals may remain, which during a chemical reaction may well create new deposits.
Lemon acid
Flushing the cooling system with citric acid is one of the best and most common options among motorists. In principle, there is nothing complicated here, you can do all this with your own hands. First, you need to drain the old fluid from the engine cooling system - do not be afraid, just follow basic safety measures. Never do anything with a warm engine. Along with this, you should definitely be aware that the coolant contains toxic substances, so it is best to work with special gloves and glasses.
Next, place your vehicle on level ground. We unscrew the cover of the expansion tank, install some container under the car, where the old liquid will drain to cool the engine. Do not forget to unscrew the cap on the bottom of the radiator! Then we rearrange the container and drain the coolant already under the motor itself. We turn to the process of flushing the cooling system. We screw absolutely all the plugs back. Pour diluted citric acid there. We start the engine and let it run for a while. It is necessary that the flooded liquid pass the entire circuit through the main channels, remove all sorts of deposits there. Then we turn off the ignition and let the engine cool down. We repeat the same procedure with citric acid several more times.
In general, the number of repetitions of the above procedure directly depends on the state in which the liquid will be drained into the container. If it does not have any precipitation and has retained its normal color, then you can stop at this, otherwise you need to repeat all the same actions until the desired result is achieved. Are you sure there are air locks in the channels? To do this, you need to disconnect the so-called nozzles of the throttle assembly - this will remove absolutely all air from the system. Do not forget to clean the radiator from dust and debris after flushing the cooling system with citric acid, since it plays an important role in the engine cooling system.
