The fan works when the stove is turned on

What to do if the cooling fan is constantly working: reasons, ways to solve the problem and recommendations

There are many important components in the car and how well they work, the quality of the car as a whole depends. One of these is the cooling system. Often on some models it happens that the cooling fan is constantly working. This is not a very good sign. Insufficient engine cooling can lead to overheating of the motor. and this, in turn, can result in the owner in a large amount for overhaul. But if you know the reasons for such work in the cooling system, you can quickly identify where the malfunction is hidden and eliminated it. In order to find a breakdown, you do not need special knowledge and skills. Even a beginner can cope with this. There are not many reasons why the cooling fan is constantly working.

One of the reasons why the fan can constantly work or often turn on is laid down in the principle of system action. The fan is launched by command of a special sensor. It is brood on the bottom of the radiator. This sensor is responsible for coolant temperature indicators. If it is more than necessary, then the radiator fan will start.

When his blades rotate, an additional air flow is created. It helps to reduce the temperature of the coolant, which will then pass through the channels in the engine. The cooling fan is constantly working only on engines, which for some reason overheat. To avoid serious problems, you must immediately respond to this problem.

The fan works on a cold motor: causes, diagnosis, repair

To begin with, the indicated problem can clearly indicate both the malfunction of the liquid cooling system and the fault of the fan itself. In any case, we are talking about a breakdown that cannot be ignored, since the risk of ICE overheating significantly increases significantly.

For a better understanding, it is necessary to superficially consider the principle of operation of the fan on most modern cars. Blowing is turned on by means of a special sensor, which is located at the bottom of the radiator. Also, many cars use a separate engine control unit of engine cooling. There are still models in which the ECU itself is responsible for the inclusion of the fan, but this design is rarely used.

So, after heating the coolant to the temperature, on average, about 100 degrees Celsius, the sensor or the control unit closes the electric circuit. After that, the fan turns on, improving the cooling of the motor. Когда температура ОЖ понижается до необходимого показателя, происходит размыкание цепи и обдув прекращается.

As you can see, on a cold engine, the fan should not work. So, in order to determine why the fan is early turning on, it is recommended to start starting with a computer diagnosis of the car with a diagnostic connector of OBD II. The fact is that the ability to consider error codes from the ECU allows you to more accurately determine the cause of the malfunction.

We also note that in cases where the control unit fixes the errors of the cooling system, the fan can spin immediately after the ignition is turned on even on a cold ICE. This feature is found only on some models and is, in fact, protection against overheating of the power unit, since the constantly working fan reduces the temperature.

After the repair in this case, it will also be necessary to discharge errors. To erase an error from the ECU, on some models it is enough to remove the terminal from the battery for a couple of minutes, while at the same time, the other reset is carried out using diagnostic equipment.

Common problems of the cooling fan

Now let’s look at the frequent problems that are associated with the cooling system and the fan itself.

• First of all, in many cases, the contact sensor of the air system is closed. In this case, blowing triggers immediately after the ignition is turned on.

In the process of diagnosis, on a cold sensor, the resistance is measured on the output using a multimeter. Deviations from the norm will indicate the need to replace the element.

• The liquid system is not enough coolant. In this case, the fan operation occurs due to the fact that a small amount of antifreeze or antifreeze heats up very quickly. In other words, the fan is working and starts naturally.

As a rule, leaks or a decrease in the level of coolant in an expansion tank are the main reason. Please note that antifreeze is a mixture of concentrate and water. Water gradually evaporates from the system, as a result, the level decreases. For this reason, it is recommended to periodically carry out control and topping of the liquid on special marks.

If there is little coolant in the system, heating occurs quickly. It is also noteworthy that the real temperature of the fluid is very different from the temperature of the internal combustion engine. It often happens that the cold engine has been launched, the temperature arrow has not yet risen on the dashboard, and the fan is already triggered due to too hot liquid. To solve the problem, it will be enough to pour antifreeze, remove air traffic jams from the cooling system.

The fan in this case can close the battery and work non.stop. In such a situation, you need to check all the contacts, wiring and other elements. The wires should be reliably insulated and properly connected.

• The fan sensor failed, which is integrated into the thermostat case. Quite a lot of modern machines constructively have a thermostat, which is combined with a fan control sensor.

Such a solution allows you to implement flexible control of the engine cooling system. However, in the event of a temperature sensor malfunction in the thermostat case, the fan can start working without disconnecting. The fact is that the control unit begins to receive incorrect signals about how the thermostat works. As a result, the emergency mode is involved, the fan turns on and works constantly.

In such a situation, you need to check the sensor with a multimeter. Normally, on a cold engine, its resistance is endless, in other cases, the indicator should be 100. 500 Ohms. Deviations in the indications from the norm will indicate that the sensor needs to be changed for a new or obviously working.

• Outdoor temperature sensor failed. Such a problem is found on some cars that are equipped with ambient temperature sensors. If the temperature is higher than the permissible limit, then these sensors use the fan.

This solution allows you to more effectively cool the power unit, especially on cars that have a powerful forced ICE and several radiators. On such units, the fan can be turned on in the warm season even on a cold ICE to protect against engine overheating.

If we talk about malfunctions, in most modern cars, the cooling system is closely related to the climatic installation. It is for this reason that the air conditioning radiator is polluted that the engine cooling fan will work constantly at maximum speeds.

To solve the problem, external cleaning of the air conditioning radiator and radiator of the cooling system may be required. The fact is that these radiators stand next to each other, dirt, dust and fluff are stuffing between them. Removing such a “fur coat” allows us to normalize the operation of the air conditioning and cooling system, get rid of frequent fan on and increased noise during it.

The climate needs help! When the ignition is turned on, the stove motor is turned on

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Tsephirek

Comrades and comrades, help me to figure it out jointly, I don’t know if the problem is something. I have owned Max A33 for three years, I have been repairing and serving. But now I am in the stoppage, I have been fighting over the problem for two weeks, I shoveled the entire Internet, including this forum, I did not find an answer. And now to the point. Tell me, with the climate turned off and the starting machine (well, or the ignition turned on) the stove (in particular the stove motor) should not rotate absolutely. Correctly? I think yes. So, in the summer I noticed that when the engine was running and turned off, it blows at the feet. I drowned out, turned on the ignition, listened as possible, barely noisy a fan, the speed, of course, is less than the minimum standard, but this is enough to blow air through the deflectors. When the CC is turned on, the fan works as expected (revolutions are adjusted in all the petals mode). Then he did not attach any importance to this, since it did not really strain, but the thought flashed that it should not be like that. Now I decided to deal with this problem:.The first thing that the fan speed was done (by the way, both the radiator and the fee were very oxidized), fell out of the field, checked it with a tester. He did not pass the verification, although I emphasize that with him the fan revolutions were regulated as the other (IRFP064N) was supplied, I checked the tester (check), soldered it into the regulator, cleaned the fee from the oxide, rang everything out of place, connected it, connected the result of zero zero. T.e. The fan both rotated and rotates with the KC turned off and the ignition turned on, although. I repeat, when the CC is turned on, the revolutions are adjusted, as it was supposedly supplied with 51 and 52 fuses-on normally. Today I measured the voltage on the fan chip with a tester- when the ignition is turned on, 10 volts appear on it. Guys, help me figure it out, because it shouldn’t be so, true? I just don’t know where to dig. Who knows the principle of operation and a fan connection scheme, maybe someone had such a problem and you safely solved it, please respond. Thank you for reading and excuse me for a large number of words, just the same problem as I did not find, so I described it in detail. Waiting for answers.

Where does the arbitrariness come from or why the radiator cooling fan is triggered in a cold engine: a list of reasons

Heat, ban and danger. the red section in the indicator of the coolant temperature cannot be perceived, so insidious overheating. The blue inframer is rarely displayed on devices of this purpose, and the arrow below the large line of “90” is the cold in the furnace, despite the “red” climate settings, and not only. The deviation from the norm beats the wallet: the wear of the motor parts accelerate and the fuel consumption increases.

Symptoms

Aerodynamic noise coming from under the hood immediately after starting the engine or after a few minutes of idling-this is a certificate that the fan is triggered in the cold engine in order. It is clear, you can hear it only near the “muzzle”, being puzzled by various preparatory concerns. In the cabin for a freelance situation, a slight change in the vibration load of the body and pedals for the worse will indicate.

Jackie Chan (Check Engine) is occasionally turned on. Coler’s work cycle is both permanent and alternating. Cases of dynamic progression of the malfunction have been noticed: the impeller initially rotates during a short time interval, and then the working time period gradually increases. Non.stop ventilation situations after turning off the ignition are not excluded.

Causes

The charm of a carburetor machine in simplicity: the antifreeze temperature sensor closed. the fan has turned on. Some problems-nickname the sensor and wire “to the mass”. On the injector, continuous puzzles:

• Violated fan power supply circuit.
• The coolant temperature sensor refused, installed in the thermostat case.
• Incorrect firmware of the ECU is installed.
• The emergency mode of operation of the motor was activated due to, say, a broken coil.
• Insufficient “cooling” in the system, which is why it quickly heats up.

Power supply

The first thing to cut off is a sticky relay. The characterized contacts of the faulty relay switch supplict constant power to the impeller electric motor, forcing it to twist the shaft even after the ignition is turned off. Using a similar relay from among secondary ones installed in the mounting unit is the best verification option.

Note. If, after dismantling the fan relay from his native seating, it still turns on on a cold engine, the problem with the “mass” break on the “relay-electrode switch”. In the same case, blowing is constantly functioning after turning off the ignition. The peculiarity of the signing of this mechanism is the constant “” and adjustable “-”.

Often the origins of the malfunction are associated with the control body. the sensor from which the computer receives information about the thermal state of the antifreeze. A simple ELM 327 adapter with the corresponding Android application for diagnosis using a smartphone will help to verify this. The list of initial actions when mismatching the data of the tidy and diagnosed information. to clean the contact group and make sure in the reliable fastening of the supply pad.

Starting adjustment

Powerful turbo engines are equipped with an auto.cooler revolutionary auto.regulatory system. The tone sets a separate control unit that accepts information from the sensors and sends a variable frequency pulses to the electric motor. In case of refusal to control the speed of rotation of the impeller or the cascading part of the electric motor, we have on the cold fan.

Where does the arbitrariness come from or why the radiator cooling fan is triggered in a cold engine: a list of reasons

Heat, ban and danger. the red section in the indicator of the coolant temperature cannot be perceived, so insidious overheating. The blue inframer is rarely displayed on devices of this purpose, and the arrow below the large line of “90” is the cold in the furnace, despite the “red” climate settings, and not only. The deviation from the norm beats the wallet: the wear of the motor parts accelerate and the fuel consumption increases.

Symptoms

Aerodynamic noise coming from under the hood immediately after starting the engine or after a few minutes of idling-this is a certificate that the fan is triggered in the cold engine in order. It is clear, you can hear it only near the “muzzle”, being puzzled by various preparatory concerns. In the cabin for a freelance situation, a slight change in the vibration load of the body and pedals for the worse will indicate.

Jackie Chan (Check Engine) is occasionally turned on. Coler’s work cycle is both permanent and alternating. Cases of dynamic progression of the malfunction have been noticed: the impeller initially rotates during a short time interval, and then the working time period gradually increases. Non.stop ventilation situations after turning off the ignition are not excluded.

Causes

The charm of a carburetor machine in simplicity: the antifreeze temperature sensor closed. the fan has turned on. Some problems-nickname the sensor and wire “to the mass”. On the injector, continuous puzzles:

• Violated fan power supply circuit.
• The coolant temperature sensor refused, installed in the thermostat case.
• Incorrect firmware of the ECU is installed.
• The emergency mode of operation of the motor was activated due to, say, a broken coil.
• Insufficient “cooling” in the system, which is why it quickly heats up.

Power supply

The first thing to cut off is a sticky relay. The characterized contacts of the faulty relay switch supplict constant power to the impeller electric motor, forcing it to twist the shaft even after the ignition is turned off. Using a similar relay from among secondary ones installed in the mounting unit is the best verification option.

Note. If, after dismantling the fan relay from his native seating, it still turns on on a cold engine, the problem with the “mass” break on the “relay-electrode switch”. In the same case, blowing is constantly functioning after turning off the ignition. The peculiarity of the signing of this mechanism is the constant “” and adjustable “-”.

Often the origins of the malfunction are associated with the control body. the sensor from which the computer receives information about the thermal state of the antifreeze. A simple ELM 327 adapter with the corresponding Android application for diagnosis using a smartphone will help to verify this. The list of initial actions when mismatching the data of the tidy and diagnosed information. to clean the contact group and make sure in the reliable fastening of the supply pad.

Starting adjustment

Powerful turbo engines are equipped with an auto.cooler revolutionary auto.regulatory system. The tone sets a separate control unit that accepts information from the sensors and sends a variable frequency pulses to the electric motor. In case of refusal to control the speed of rotation of the impeller or the cascading part of the electric motor, we have on the cold fan.

The fan of the cooling system

Before telling about the search for faults, you should say a few words about the cooling fan itself. It serves to create a flow of air aimed at the radiator and an employee to cool the last. The fan is turned on automatically when the temperature sensor is located under the radiator is triggered.

When a temperature of 100-105 C is reached, the sensor closes and starts the rotation of the fan, which produces a radiator blowing and cools it. As you can see from this, the normal inclusion of the fan is possible only with a completely warmed engine, and its launch with a cold motor indicates obvious problems in the system.

Work of the cooling system VAZ 2114

Fans of the cooling fan: signs and methods of elimination

As mentioned above, the internal combustion engine is a complex system that requires uninterrupted operation of the cooling system. Otherwise, the power plant overheats will occur, which can lead to a breakdown and, therefore, expensive repair.

The liquid cooling system along which special coolants circulate (antifreeze/antifreeze) are closed is closed. In a nutshell, the principle of operation of the liquid cooling system is that during the engine operation through its shirt (channels in the BC and the HBC) circulates a liquid that removes excess heat from heated parts.

Then the hot liquid gets into the radiator, cools and returns to the engine again to cool it. During the passage of the radiator, the heated coolant enters the network of thin tubes. This contributes to its rapid cooling. Also, a flooding air flow when the vehicle moves excess heat is carried out outside the engineering space of the machine.

However, if the air is not enough (during downtime in traffic jams or during the operation of the engine at idle), the liquid system often does not cope with the task. Then the radiator fan comes into the work. In other words, the air cooling system is connected.

It is important to understand that only when the two systems are interacted, effective engine cooling occurs. If simply, the fan thermal switch (fan sensor) is triggered and the fan turns on. As a result, an air flow is created and the fan works until the optimum temperature is reached.

Then, having received the sensor signal about a decrease in temperature, the radiator fan is disconnected. By the way, there is also no single standard at the place of installation of the fan. It can be placed both before the radiator and behind it. There are also no clear standards regarding the design of the fan.

It consists of at least four blades fastened together at a special angle for the maximum fence and air supply. The most popular was the impeller for 8 blades. By design, the fan drive can be divided into 3 types:

Today, the first type is practically not used, especially on civilian cars, although it remains on powerful SUVs as the most reliable. The second type also gradually fades into the background. In any case, when the device fails, immediate diagnosis is required and eliminating the cause of the breakdown.

In this case, the check can often be carried out independently. Please note that during the diagnosis, the fan can suddenly earn and its blades seriously injure a person. Fingers are in a special risk zone.

Cooling fan checking

So, with a breakdown of a modern fan, it must be borne in mind that they are often electric. As a rule, the problem lies in wiring, sensors, fuses, etc.D. Among the main faults of the fan can be distinguished the most common cases when the cooling fan:

You can control the fan operation in several ways. If the fan does not turn on, it may not receive the necessary signal. In this case, first of all, the whole circuit of the transmission of this signal is checked. For this, using a tester, it is determined whether there is a supply voltage. If it is not, then the problem is in a burned fuse or poor contact.

Giving the voltage to the fan itself, it is precisely its serviceability. If he is spinning, then the problem is not in him. If the fan does not spin, it is better to contact a car service. You can get to a service station with your move, adhering to certain rules:

• Move at a speed of at least 60 km/h. Then the function of the broken fan will be performed.
• Turn on the stove on the maximum while driving so that the excess heat is released into the interior. It will be hot in the cabin, but the chances of the fact that the motor will not overheat is increased;
• Monitor the engine temperature arrow on the panel. When it approaches the red zone, you need to stop the car, open the hood, cool the motor.

When checking the temperature sensor, its wires are disconnected and close to each other. If the problem is in it, then the fan will work. In this state, you can get to the nearest one hundred for repair. And if the fan does not work, then it is most likely to be changed.

If the radiator fan, on the contrary, works without stopping, then the problems in the thermal attewer, the closure of the wires or in the “sticking” of the relay contacts, when its contacts cannot open and the voltage for the fan continues to be supplied.

The thermostat responsible for maintaining the optimum engine temperature may also be the reason for the constant operation of the cooling fan. When the antifreeze temperature exceeds more than 90 ° C, a special valve opens between the large and small circle of the cooling system.

With a breakdown of the thermostat, this valve jams, the antifreeze often moves only in a small circle (without getting into the radiator for cooling). As a result, the fan will work all the time.

We also recommend reading the article about why the engine is warming up and the radiator is cold. From this article you will learn about the reasons for overheating of the power unit, while the radiator of the cooling system does not heat up.

It is not difficult to determine this problem. If, when feeling the radiator hoses, they will be cold, and the engine itself is hot, then the problem is in the thermostat. We add that usually jamming of the thermostat valve can be solved by knocking on its body. If this does not help, then the device must be removed and changed.

• Another fan may turn on before the need. Most likely, this is a breakdown of a thermal attenter, which is subject to replacement. You also need to take into account the types of sensors. They can be designed for different temperatures (the so.called “summer” and “winter” thermal attires). They work taking into account the given temperature. If the “winter” sensor is used, you need to know that it is late and turns on a little later.

How the fan works

On the older generation, the fan worked forcibly, that is, he always worked while the engine was launched by a drive belt. Typically, the fan itself was attached to the pulley pulley connected by a belt with a pulley of the generator.

In most modern cars, an electric fan is used, or a drive with a viscous clock (viscous coupling), where its operation occurs automatically from the inclusion sensor (tarred separately for each engine).

Fan, this is a simple 12V electric motor operating from a car network. The impeller is installed on its shaft to create an air flow directed at the radiator honeycomb. The fan itself has a fastener for connecting to the radiator.

For its operation, in turn, the inclusion sensor located in one of the radiator tanks is responsible. It is installed in the rupture of the wires of the fan electric motor.

The damper does not overshadow

If the damper, which directs the air either through the heater radiator or bypass, begins to be capricious over time, then part of the cold air (or even the whole!) will go past the heater radiator without any heating. How much time and money will have to be spent on repairs? If the damper is jammed, cleaning and lubrication usually helps. And if the damper itself fell apart for pieces, you will have to look for the same on disassembly. do not buy a heater block assembly. The cost of replacement depends on the car and the complexity of the heating system.

One of the most frequent electrical malfunctions on cars with manual control of the heater is fan breakdown. It is much more difficult to look for the reason by cars with climate control. Automation is in charge with both all the damper and the fan, and to accurately determine the malfunction, it is advisable to consider error codes. Some systems can be diagnosed independently by pressing a certain combination of keys, but more often you have to contact specialists with scanners.