Welcome! Coolant - without it, cars would boil, because it plays the most basic role in the engine cooling system, namely, it flows through the pipes and cools them, and this liquid itself is cooled by the radiator and the fan that blows on it, as well as the radiator blows the air flow, this becomes especially noticeable when driving a car quickly, when the car practically does not heat up.
Note! In order to replace the coolant, you will need to stock up on: Firstly, an empty, preferably very wide container (It will be most convenient to use an ordinary basin, which is unnecessary for anyone, or if you are replacing it in a pit, then it will be possible also use a bucket, or something else where you will drain all the waste liquid), and you will also need to take with you a wrench somewhere “13” and “17” and find, as already mentioned, an inspection hole , because replacing the coolant in the inspection hole will be much more convenient than trying to drain it while the car is standing on the ground, although in this case it will be possible to jack it up, but keep in mind the fact that you will need to place bricks under the rear wheels, otherwise the car may simply fall off and fall to the ground, and by the way, if you lift the front of the car with jacks or with just one jack and put bars or boards under the other side (don’t ever put bricks under the car, there have been cases when they fell apart and the car fell to the floor), so make sure that the front part of your car is at the same level and make sure that the right part, for example, is not higher than the left, and the left is not higher than the right!
When should you change the coolant? In fact, it all depends on what kind of liquid you purchased in the store, respectively, if it is fake, then in this case you will have to replace it immediately, otherwise corrosion will begin to occur in parts of the car engine (More on this below in the “Note!” paragraph), but what should I do if I bought a car and the owner told me that he changed all the lubricants (Oil, antifreeze, etc.) in my purchased car, how can I check this, you ask?
It’s all very simple, in order to check whether it’s time to change the fluid or not, first open the expansion tank, which is closed with a lid (Open the tank only on a cold engine, otherwise if your system is depressurized, then the fluid may simply splash out sharply when the engine is heated and go jet, this will cause you burns), so after unscrewing the cap (Indicated by the arrow in the photo below), take a visual look at the color of the liquid you have in the tank, basically all liquids that cool the system have a certain color, that is, antifreeze can be blue , antifreeze red, etc.
Therefore, after you have looked into the tank, visually determine whether the fluid needs to be replaced or not, namely, it will need it if it changes its color to the color of rust, and also if an oil film appears on the surface (This can be very easily determined visually). .
Note! Many people put off replacing this fluid, but the car is running hot, so what do they say, remember once and for all, most engine parts, for example, parts such as the crankshaft, camshaft, the cylinder block itself, etc. They are lubricated with coolant due to the fact that small holes are made in these parts so that this liquid gets into them and cools them from inside, and in the case when the coolant becomes unusable, it begins to gradually, so to speak, devour all these parts due to why premature corrosion occurs, which can ultimately lead you to a major engine overhaul, but it seemed like it was just some kind of coolant, and so many troubles can be caused by it, so when purchasing, be careful too, as at the moment, a lot of fakes are sold on the market! (For information on how to identify counterfeit coolant, see the interesting article entitled: “Detailed information about antifreeze and the so-called antifreeze that is poured into a car engine.”)
How to replace coolant on a VAZ 2110-VAZ 2112?
Note! Before we begin, we will give you a couple of tips so that you are prepared to face this situation, namely, many car owners constantly grab their heads when they pour liquid into the tank, after which some time passes, they open the hood and see that the liquid has dropped below the level (Now you will understand where this is all leading, read carefully), we even once observed such a situation, a young man of about 20 years old came to us, he wanted us to change his expansion tank for a new one and he told us that I had recently poured new fluid into the reservoir, after which he drove the car and it fell a little, we asked him, and when you checked the fluid, the engine of your car was cooled down (That is, the check was carried out on a cold engine), he answered us that no, the engine was hot, but when he looked at the marks that are located on the sides of the barrel, he saw that a small part of the liquid had disappeared, we explain why this happened!
The thing is that the cooling system pipes constantly change their shape, they either expand (If the engine is very hot) or narrow (If the engine is cold), so as a rule, the coolant level should only be checked on a cold engine, because on a hot one it really is the fluid may even be less than the minimum MIN mark, but this does not mean that you need to immediately run and pour new fluid into the tank, in this case you just need to wait until the engine cools down, thereby you will even see how the fluid becomes a little more in expansion tank and only after that you will need to add new fluid into it and continue driving! Draining: 1) At the very beginning of the operation, find a place where your car will stand level, or if this is not possible, then place the car so that the front of the car is higher than the rear, but not vice versa.
2) Then remove the “-” terminal from the battery, otherwise if liquid gets on the exposed wires, a short circuit may occur, which in turn will cause a malfunction of the wires on which the liquid gets. (For information on how to remove this terminal, see the article: “Replacing the battery on all VAZs,” point 1)
3) Next (This operation is only for injection machines), remove the ignition module so that it does not interfere with unscrewing the drain plug of the cylinder block. (For information on how to remove the module, see the article: “Replacing the ignition module”)
Note! The module needs to be removed only with the bracket, because if you remove only one module, then in this case the bracket of this module will block the way to the drain plug, so we remove everything together!
4) Next, to drain the coolant from the system a little faster, unscrew the cap that covers the cooling expansion tank.
5) Then, using a wrench or, best of all, a spanner, completely unscrew the plug that is located on the engine cylinder block, you got to it earlier when you removed the ignition model from the car to access it, so for a more detailed location of this plug, look at photo below, where a man points his finger at this traffic jam:
Note! Before you start unscrewing this plug, be sure to place an empty “10 liter” container under this plug, and after this plug is unscrewed, drain all the coolant from the cylinder block into this container!
6) Then, when all the liquid from the block has been drained, we recommend that you wipe the car engine with any rag, namely, wipe the places where the liquid got in when draining.
7) Now do not wrap this plug and go to the plug that is located on the radiator and in the same way unscrew it completely, and drain all the liquid remaining in the radiator into a container.
Note! Next to the radiator drain hole there are wires and the generator itself. If possible, try to protect these things somehow, for example, throw a rubber rag over them so that liquid does not get on them, otherwise they can easily fail!
Next, screw all the unscrewed plugs back into place, because all the liquid from the system has been drained, so now we will move on to filling.
Filling: 1) First (This point applies only to the injector, but be sure to read the note if you have a carburetor), loosen the clamp and remove the fluid drainage hose from the throttle assembly, it is also called the throttle valve, and then put this in some convenient place hose (So that it does not fall) and pull the part with which it was connected to the throttle up to the very top and leave it like that.
Note! If we are talking about a carburetor engine, then in this case perform exactly the same operation but only with a slightly different hose, namely with the carburetor heating hose, it is indicated by the arrow below:
2) Then carefully start pouring coolant to the required level and watch whether this liquid flows from any hose, if it flows, immediately stop pouring the liquid (Put the canister on the floor) and put the hose in its place, and after putting it on, fill it liquid to the required level and tighten the plug.
Note! If you keep pouring liquid and pouring it, but it doesn’t come out of the hose, then stop pouring and grab this hose with your hand and then carefully lower it slightly, if the liquid poured as indicated by the arrow in the photo below, then in this case, put this hose in its place, tighten the clamp that secures it and continue to pour liquid into the tank to the required level!
3) And finally, if after replacement (no matter how long) you notice that your engine is heating up very much, and the stove is not heating at all (cold air is coming out), then in this case, remove the air lock from the system. (How to remove a plug on an injector, see the article: “Removing an air plug on a VAZ”)
Note! On the carburetor, the plug is removed in the same way as on the injector, so read the article to which there is a link if you have a carburetor, but just always remember that on the carburetor there is another hose, that is, a heating hose, and on the injector there is another hose that is connected to throttle fitting, in general, read it carefully and you will understand what we are talking about!
Important! 1. Be sure to change this fluid only on a cold engine, otherwise when the engine is hot, it sometimes heats up to very high temperatures of the order of 95-110 degrees and maybe even higher (The coolant temperature is shown on the instrument panel on a special sensor, some people still called the engine temperature sensor), so it cannot be replaced on a hot engine, because you can very easily get scalded by it when draining.
2. Also, be sure to take into account the fact that coolant is a very toxic substance, so if it gets on your skin or eyes, run immediately to the washbasin and rinse the area, otherwise this liquid will harm your body.
Note! By the way, do not take and under no circumstances leave an open bottle of this liquid at home, because the vapors of this liquid are also poisonous and can also harm your body!
3. And in conclusion, let’s note some factors, namely, replace this fluid only with gloves (You can do without them, but there is a possibility of drops of this fluid getting on the skin), and also do not under any circumstances drain the used fluid onto the ground, that’s all take care of the environment and, first of all, take care of the ecology of our country and something else, if you decide to add this liquid to the tank, for example, it runs out there, first of all, do not mix it with anything (Meaning exactly what is needed fill in liquid of the same brand and produced only from one manufacturer and this is mandatory) and secondly, after topping up, do not under any circumstances start the car with the expansion tank cap open, since it must be closed when starting!
How to remove an air lock from the cooling system of a VAZ 2112
If the new fluid was added incorrectly, the cooling system will not work correctly.
To eliminate airiness, squeeze the pipe from which excess air comes out. After this, it is necessary to increase the pressure in the expansion tank. When antifreeze begins to come out of the return line, then the procedure can be stopped.
After this, you need to tighten the plug and put on the terminals. During the first start, keep the engine speed high, this will also help stimulate the release of excess air.
Checking the correct filling of antifreeze is carried out as follows: as the engine warms up, the radiator cooling fan should turn on. If the stove next to the fan starts to heat up, it means the work was done correctly.
If the system does not heat up, it is necessary to check the tightness - perhaps a leak has formed somewhere. If there is no leakage, then the air has not completely escaped.
Replacing antifreeze on a VAZ 2112
Photo VAZ 2112
If you buy a car, put it in a cupboard and admire it, then you definitely won’t need to replace any working fluids. And since a normal car is constantly in use, it requires maintenance. One of the types of work that needs to be done is replacing antifreeze or antifreeze - in a word, coolant.
Cooling system design
This article provides instructions on how to replace antifreeze in a VAZ 2112 yourself. Here you will find some features that are important to pay attention to when replacing the coolant, a video on the replacement and a detailed description of the process itself.
What to remember before changing coolant
Do not mix antifreeze and antifreeze, as well as coolants from different manufacturers. This leads to the appearance of sediment. The consequence may be failure of the water pump, thermostat and the cooling system itself.
Before draining, you must unscrew the battery terminals. This prevents the wires from shorting when they come into contact with liquid.
After turning off the car, at least an hour must pass before the antifreeze begins to drain. You need to let the system cool down, otherwise when the engine is hot, the liquid may suddenly spray out and burn you.
WHY CHANGE ANTIFLEGE AND HOW OFTEN DO IT?
Let's start by answering the first question - do you need to change antifreeze and why change it? The answer is clear - it needs to be changed, since it, like everything else, has the excellent ability to lose its properties.
VAZ 2112 how to replace antifreeze
Plus, the loss of the quality of the liquid occurs not only from the expiration date, but also from the fact that it is in an engine that is subject to corrosion - that is, the antifreeze becomes brown or red.
How often is it necessary to replace antifreeze on a VAZ 2112? According to official data, this must be done every 2 years or every 45 thousand km. Some advise changing every year.
This is often not necessary. If the car is old and “leaks” every winter, then this can be done. But the VAZ 2112 is not a rare car, so once every two years will be enough. How else can you determine that antifreeze needs to be changed? This can be done by color.
Looking into the expansion tank, see what color the antifreeze has become. Pure antifreeze has a bright blue color. Black and red color is a clear indicator of the need for replacement.
Antifreeze should have the color as in the photo
Procedure for replacing fluid in the cooling system
Before adding any coolant, close the engine and radiator caps, and then fill the system with antifreeze. It will be required so much that the liquid level in the expansion tank reaches the point where the belt fastening passes.
Upon completion of work, tightly screw the cap of the expansion tank and return the hose leading to the heating system. Please note that high pressure occurs in this assembly. If you do not tighten the plug tightly enough, it may break off during operation. This will inevitably lead to antifreeze leakage.
Before starting the engine, perform reverse assembly - install the ignition module and return the negative terminal to the battery. After the work described in this section, you can start the engine to warm up. You shouldn’t start driving right away - let the engine run for a while, and then check the fluid level in the expansion tank. If there were air pockets in the system, the amount of antifreeze will decrease. The top edge of the fluid will not reach the location of the belt on the reservoir. In this case, let the car sit for a while and then add antifreeze.
Sometimes, by warming up the power plant, the air plugs are not pressed through. In this case, it is necessary to repeat the procedure with the hose (described in the previous section), at the same time open the cap of the expansion tank. After excess air has escaped, it is necessary to add antifreeze to the required level.
ANTIFREEZE OR ANTIFREEZE?
The answer to this question is not clear-cut. If you do not take into account the car manufacturer, but look solely at the quality of the coolant, then antifreeze, of course, loses to antifreeze.
There are different types of antifreeze
Antifreeze has many additives that can make it very suitable for winter. Freezing and boiling temperatures can make a huge difference. Another point is that antifreeze is specially designed for VAZ cars. It is suitable for our climate and operating conditions. Another plus is that the price of antifreeze is much lower than that of antifreeze. Usually, owners of VAZ cars pour antifreeze and drive with a clear conscience.
Reasons for replacement
When replacing antifreeze on a VAZ 2110, you must adhere to several rules. The engine must be cold, antifreeze is a toxic liquid; when working with it, it is necessary to avoid contact with the eyes, mouth and prolonged contact with the skin.
Antifreeze, coolant (antifreeze) is a special composition of automotive fluid based on ethylene glycol. Used in the cooling system of an internal combustion engine (ICE) for operation at low ambient temperatures. There may be several reasons for replacing antifreeze:
- car mileage, 75,000 – 100,000 km. mileage;
- time interval 3 – 5 years (it is recommended to check the condition of the fluid at a car service every year before the start of the winter season with a special device);
- replacing one of the components of the cooling system, water pump, pipes, radiator, heater, etc., with such replacements, antifreeze is still drained from the cooling system and it makes sense to fill in a new one.
This material will help you understand the engine cooling system:
Cooling system VAZ 2110
ESSENTIAL TOOL
What tool is needed to replace antifreeze in your VAZ 2112:
- Head 13 with ratchet or wrench
- Head or wrench 17
- Key for 10
- Container for draining antifreeze
- Watering can
Any basin that will fit under the car will do.
That's probably all you need. As you can see, no special costs are required.
Which antifreeze to choose
It is necessary to buy antifreeze only in specialized stores, and give preference to those manufacturers whose reputation is beyond doubt. As for the choice, it is better to use the type and brand of coolant that, again, is recommended by the car manufacturer.
Let's take, for example, Russian-made antifreeze A-40M, or A-65M. Both of these fluids are ideal for any “tens” engine. The refrigerant marking letters have the following designation: A - automotive, M - modernized.
The numbers are the freezing temperature of the antifreeze. A concentrate is also available for sale. It is designated “Antifreeze AM”. All of the listed liquids, which is important, are produced in accordance with GOST 28084-89
REPLACEMENT OF ANTISEASE
Now let's move on directly to replacing the antifreeze with our own hands.
Advice! Before replacing antifreeze, remove the protection from the engine. Firstly, the liquid will drain more easily. Secondly, it will be easier for you to “catch” the stream with a basin.
Removing protection for VAZ 2112
Before draining the antifreeze, unscrew the negative terminal of the battery. This is done to prevent the wires from shorting, because liquid will get on them.
Draining antifreeze
Drain the coolant. The fluid is drained only from a cold engine. So:
- First you will need to use a 13 and 17 key to unscrew the ignition module with the bracket. You can, of course, try and unscrew the drain plug from the block without removing the bracket, but more effort and nerves will be spent.
Replacing antifreeze VAZ 2112
- Now we unscrew the drain plug of the VAZ 2112 cylinder block. This is done using a 13mm socket and a ratchet or other convenient wrench.
- After this, very little liquid will drain. Now unscrew the expansion tank cap to drain all the fluid from the block. You can do this in advance.
- Next, you need to unscrew the drain plug from the cooling radiator. You don't need any tools for this - it can be easily unscrewed by hand.
Radiator drain plug
- After all the liquid has drained from the block and radiator, you need to screw back the two plugs.
- Reinstall the ignition module with bracket.
This is where the drain ended.
Flushing the cooling system
Often, replacing antifreeze on a VAZ 2112 can be done without flushing the system. You don’t have to do it, in principle, but consider the option of washing.
Note. To flush the engine cooling system, you can use a special flushing liquid, or you can use ordinary distilled water.
Flushing the cooling system
So:
- To flush the engine, pour the required amount of distilled water or a specially prepared flushing solution with water into the engine.
- After this, start the engine and give it time to run. About 10 minutes.
- Then drain the water and repeat the procedure.
- You can rinse until the water becomes clear when drained. But considering that often washing is not done at all, two times will be enough.
Pouring antifreeze
After draining the antifreeze and flushing the cooling system, it is necessary to fill in new antifreeze. It will require about 8 liters.
It’s more convenient to pour antifreeze with a watering can
So:
- We insert a watering can into the hole in the expansion tank for convenience.
- We fill the antifreeze gradually so that the air leaves the system.
- To completely fill the system, squeeze the upper pipe coming out of the radiator.
- After filling the system, pour about half into the expansion tank.
Advice! Under no circumstances fill the expansion tank full! Antifreeze will simply pour out of there!
Eliminating airiness
If you do not perform some operations, the cooling system of your VAZ 2112 will be air-filled and will not work correctly. To eliminate this defect, do the following:
- Again, during pouring, squeeze the pipe so that air comes out.
- After filling, it is necessary to create pressure in the expansion tank. In simple terms, just blow into the expansion tank. Not just of course, but pressed against it so that air does not escape through the filler neck.
- In this primitive way, pressure can be created and air will leave the system.
- A sign that there is no air left in the system is the release of antifreeze, not air, from the return line.
- Also, after starting the engine, you need to “give” the engine good speed - this also helps.
These are some simple ways to get air out of the cooling system.
Filling with new antifreeze
To fill in new antifreeze, you must open the expansion tank. A funnel is inserted there and liquid is introduced very slowly. Gradual infusion is necessary to remove air from the system.
In order for the fluid to fill well, it is necessary to compress the upper radiator hose. After the entire cooling system is filled, the expansion tank is filled halfway. This is enough to ensure stable functioning of the mechanisms, so that excess does not spill out.
After filling the system, it is recommended to drive the car several kilometers. The liquid will be distributed throughout all mechanisms and more antifreeze can be added.
When draining and replacing antifreeze, extreme care must be taken. Antifreeze is a toxic composition, so it is important to use personal protective equipment to prevent the liquid from getting on the skin and mucous membranes.
If liquid suddenly gets on your skin or in your eyes, you should immediately rinse them with plenty of water.
For the same reason, do not leave an open container of antifreeze for a long time, as it releases toxic fumes, and do not pour the remainder into the ground.
Replacing the temperature sensor
An analogue of a foreign-made temperature sensor,
In order to replace the temperature sensor, no special skills are required, you just need to strictly follow the following instructions:
- Remove the negative cable from the battery.
- Then drain a small part of the coolant from the radiator.
- We remove the air filter housing for ease of dismantling.
- Next, remove the block with wires from the temperature sensor.
Pay attention to the amount of signs of corrosion.
New sensor installed. Planted on anaerobic sealant
Before purchasing a new sensor, you need to make sure that the part numbers between the old and new element are similar.
When and why do you need to change the refrigerant?
According to the vehicle manufacturer's recommendations, the engine coolant should be replaced every 75,000 kilometers or 3 years of operation, regardless of how old the vehicle is. In addition, the coolant should be replaced when the car owner discovers that it has lost its properties, changed its color or consistency.
If this is not done, the engine is at risk of overheating. In addition, low-quality coolant causes scale to settle in the cooling jacket channels, mainly in the radiators and radiators.
Replacement features
If there are small leaks in the engine cooling system and the car owner periodically adds water or antifreeze from different manufacturers, the old coolant may take on a rusty color. Foreign bodies may appear in the form of small chips and rust, which, by the way, can lead to failure of the main elements of the cooling system, water pump, thermostat, heater tap, etc.
In this regard, when replacing old antifreeze in this condition, it is necessary to flush the system. This can be done using different additives, which is not always beneficial for the cooling system. Low-quality cleaning additives may not only not help, but also damage the components of the cooling system. Therefore, it is necessary to use high-quality additives and not skimp.
You can also flush the system naturally with distilled water. After draining the old antifreeze, water is added. The car idles for 10-15 minutes, then it is drained again and new antifreeze is added. If there is severe rust, you can repeat the procedure.
There is a cheaper and easier way; you can simply flush the system with plain water by opening the radiator and engine caps in sequence. Those. the engine cap is unscrewed and water is spilled through the expansion tank. Then the engine plug is closed and the radiator drain plug is opened. Do only in this sequence, since the radiator is at the lowest point and all the water will pour out.
In this article we will look at how to change the coolant. Many car owners have never changed the antifreeze (antifreeze) on their car, and therefore do not know how often to change the coolant and after how many kilometers it needs to be changed.
So, the coolant on the VAZ 2110 and VAZ 2112 must be changed after 75,000 km or after 5 years of operation of the car, whichever comes first. Personally, I have never changed mine, although the car has already driven about 100,000, but I topped it up a lot, because... very often there was a leak, I will talk about this in a new article, about the cause of the leak and how I eliminated it.
How to combine antifreeze with a VAZ-2110 injector (16 valves)
Tools and Tools Required:
- keys 10 and 13;
- capacity 8-10 liters (canister or bucket);
- dry cloth.
For merging antifreeze VAZ-2110 (16 valves
) must be brought into a pit or overpass. Further work is performed in the following order:
- Disconnect the negative cable from the battery.
- We turn the plug on the expansion tank.
- We sit in the hole, disable the bolts that protect the engine using a 10-key wrench. We are removing the protection.
- We unscrew the drain plug on the radiator, replacing the container with it. Wait until all the antifreeze in the heat exchanger flows.
- If your car is driven by a cable, you will have to remove the starter before you drain the antifreeze from the VAZ-2110. The drain plug is located directly below it. To do this, disconnect the relay relay connector connector, remove the protective cap from the positive wire mounting nut, unscrew it, remove the wire, and then remove the three starter mounting bolts. After this, replace the container with the plug, turn it and let the coolant flow through. If the transmission is traction controlled, the starter should not be removed.
Nuances of antifreeze
There are many opinions as to whether antifreeze is actually better than antifreeze. We will not prove our position, but rather we will tell you a few facts.
Why is it better to use antifreeze when replacing coolant in a VAZ 2110? The choice is always up to the car owner, but this particular coolant has a wide range of advantages:
- When heated, the degree of expansion of antifreeze is less than that of water. Therefore, the presence of even a small gap for expansion will allow it to protect the system from rupture and maintain the integrity of the pipes and caps of the expansion tank;
- The boiling point is higher than that of water;
- At sub-zero temperatures, the coolant does not turn into ice and acquires a gel-like structure, which does not lead to rupture of the cooling system (CO);
- Does not form foam;
- Does not cause corrosion. Moreover, it has the function of preventing its occurrence.
How to change antifreeze in a VAZ 2110 yourself
The procedure for replacing the coolant in a VAZ 2110 is not complicated and can be done independently. Compliance with the basic rules during coolant replacement work is mandatory:
- availability of protective equipment (gloves, goggles);
- a set of necessary tools, drainage containers, rags, the required amount of antifreeze or antifreeze;
It is also important not to open the reservoir cap on a hot engine, be careful during work, and avoid getting antifreeze on your skin, eyes, etc. (antifreeze and antifreeze are strong poisons).
So, at the initial stage, it is important to know how to drain the VAZ 2110 antifreeze:
- place the car on a flat surface or place the car so that its rear part is slightly lower than the front (the amount of fluid drained will be greater);
- after turning off the engine, wait until it cools down completely, then disconnect the negative terminal from the car battery;
- Having removed the bracket and the ignition module, open access to the cylinder block of the vehicle’s internal combustion engine.
- then you need to unscrew the cap of the expansion tank, having previously installed a container under the drain plug to drain the used coolant;
- drain the antifreeze until the flow stops and the coolant stops dripping).
- wipe the cylinder block from any remaining antifreeze (antifreeze), then repeat the draining procedure by placing a drain container under the radiator and unscrewing the radiator cap;
- after the fluid flow has completely stopped, check the condition of the fasteners, plugs, pipes for damage, defects (if any, replace damaged parts with new ones);
- tighten the drain plugs of the cylinder block and radiator.
Operating principle of the sensor
This device is an ordinary resistor (thermistor - approx.), i.e. a device capable of changing its resistance depending on the temperature that surrounds it.
The sensor is mounted in the metal outlet pipe of the cooling system on the cylinder head through which antifreeze flows.
The purpose of this sensor is to monitor the temperature regime of the entire cooling system, and if the temperature rises, send a pulse to start the engine cooling system. If the sensor is faulty, it will not send a signal in time and the engine cooling fan will not work.
