Symptoms of malfunction
You can determine if there is a problem with the cooling system fan by a rapid increase in coolant temperature. A corresponding warning message appears on the vehicle's dashboard indicating an increase in coolant temperature. The car owner should turn off the engine and wait until it cools down, after which you can carefully continue driving. Remember that it is not recommended to operate a car with such a non-working fan, as there is a risk of damage to the cylinder head, which invariably forces labor-intensive and expensive repairs. Such breakdowns can also be detected by visual inspection of the radiator and fan. If, with a significant increase in coolant temperature, the fan does not turn on, this may indicate the presence of various breakdowns of this unit.
There can be several reasons for a fan malfunction :
- Temperature sensor failure.
- Lost contact at the temperature sensor connector.
- Broken electrical wiring.
- Relay problems.
- The fuse has blown.
- Fan motor drive malfunction.
What measures to take in case of problems
Self-repair is possible only if you have the skills to work with tools and knowledge of the design of your model. With your own hands you can:
- Replace the door seal. The type of part is indicated in the technical documentation. Repair occurs strictly according to the manufacturer's instructions.
- Install the thermostat and temperature sensor. The circuit is pre-tested with a multimeter. The components are selected only for a specific refrigerator model.
- Replace the compressor. Repairs are only possible if the user fully understands the design of the parts and has experience.
- Top up the refrigerant, but only with special equipment and professional skills.
- Having your refrigerator repaired under warranty will save you money or get your equipment repaired for free.
- Call specialists from the brand’s service center who will professionally eliminate simple and complex faults.
Watch the video why the compressor on the refrigerator does not turn off
Necessary tool
The choice of tool used will directly depend on the nature of the breakdown. Often it is enough to open the relay box and replace the blown fuse with a new one, which will restore the fan’s functionality. Whereas in case of significant breakdowns, when the cooling fans of the VAZ 2114 do not turn on, it is necessary to dismantle the radiator, remove the fan, or change the relay and corresponding temperature sensors. To remove the fan you will need:
- Crosshead screwdriver.
- Socket wrenches 8 and 10
How to check the cooling system thermostat
Testing it is quite simple. To do this, you need to start the engine and warm it up to such temperatures when the valves of this mechanism operate. You can find out the temperature threshold directly on the device body. Usually it is 72 or 80 degrees. Then you need to check the temperature at the lower and upper pipes. If both are at approximately the same temperature, then the reason why the cooling fan is constantly running has been found. It is recommended to carefully inspect the thermostat valves after removing it. It is useless to repair this unit (it is easier and cheaper to buy a new one). By the way, if this element is dismantled, it can be checked without installing it in the car. To do this, the thermostat is placed in a container of water, which is then heated. Increasingly, the valve should open. If this does not happen, the device is faulty.
Step-by-step algorithm of work
In each specific case, fan repair will differ depending on the existing breakdown. It is necessary to carry out appropriate diagnostics, which will allow us to determine why the radiator cooling fan on the VAZ 2114 does not turn on in a timely manner, which will simplify subsequent repairs. First of all, it is recommended to disconnect the fan connector, and then, observing the polarity, reconnect the connector directly to the battery terminal. If, with such a direct connection, the fan begins to rotate, this indicates a working drive, and the reason in this case may be electrical wiring, a faulty temperature sensor, or problems with the fuse. You can check the fuse responsible for the operation of the cooling fan without opening the plastic box. The fact is that such a relay is dual and is simultaneously responsible for the operation of the horn. Therefore, if the car's sound signal disappears and the fan does not work at the same time, this indicates a blown fuse. The block with such relays is located under the hood in a small plastic box. To open it, you need to remove two latches, then use tweezers to remove and change the fuse you need. Relay failures are difficult to diagnose. We can recommend that you get a 100% working relay, temporarily install it in the socket and check that the fan is turned on correctly. If during such a test the fan starts working, then you should simply replace the relay used with a working one. To check the temperature sensor, from which the signal goes directly to the radiator, disconnect the connector from the sensor and then turn on the ignition. In this case, the automation starts the fan for constant blowing in emergency mode. If, when the connector from the sensor is disconnected in this way, the fan turns on late, then we can therefore conclude that the temperature sensor has failed and will require replacement. The temperature sensor itself is fixed with two bolts, which can be unscrewed with a simple Phillips screwdriver. This sensor replacement usually takes no more than 5 minutes. If the cause of the breakdown is still the fan, you can try to repair it first or immediately replace it with a new one. The problem may be with the bearing or brushes. In this case, you can replace such damaged parts, which will completely restore the functionality of the cooling system fan. If the cause of the fan breakdown is the electric motor, then the repair presents certain difficulties, and such a failed drive is best replaced with a new one.
Additional recommendations
If desired, you can install an additional button that will forcefully start and stop the fan.
VAZ 2114 fan diagram with a button
In order to do this, you will need:
- purchase a button (or toggle switch) and mount it in any convenient place (you can even under the hood);
- make a branch from the wire coming from the battery positive to the fan relay, soldering another wire to it;
- connect this wire to the first contact of the button;
- connect the second contact of the button to the relay leg, from which the “positive” wire goes to the fan.
Thanks to such a simple circuit, it will be possible to control the operation of the fan manually.
Fan device on VAZ-2114
4-blade radiator cooling fan
Before moving directly to the causes and methods of solving the problem, it is necessary to understand the design features of the unit. In other words, how does a radiator fan on a car work?
Cooling system fan design
Radiator and electric fan parts: 1 – radiator; 2 – radiator cap; 3 – electric motor; 4 – casing; 5 – impeller; 6 – rubber cushion; 7 – drain plug
It is also worth considering the electrical circuit of the radiator fan:
Cooling fan wiring diagram
The fan does not turn off: the main causes of the malfunction
Now that we know how the fan radiator works, we can move directly to the issue of identifying the reasons for its failure. So, let's look at what causes the node to not turn on:
- Wiring shorted.
- Relay.
- Temperature sensor (see “Replacing the coolant temperature sensor (DTOZH)“.
- ECU.
Elimination methods
A visual diagram of connecting an electric radiator fan with a forced activation button.
After the motorist has identified all possible causes, it is necessary to move directly to elimination methods. It is worth warning that this malfunction is associated, for the most part, with electrical circuits , where certain knowledge is required, therefore, if the motorist is not confident in his abilities, he should contact a car service center.
Let's consider them in order.
Closure
The first and most common reason for such a malfunction is a short circuit (and most often, fusion) of the wires going to the fan. As a result of this short circuit, the electrical circuit turns on, regardless of the operation of the temperature sensor and relay. It is very simple to identify such a malfunction - just ring all the wires and check whether they are shorted (in some cases, the fact of fusion of wires can be detected even visually during inspection).
Fusion of two wires
If the “diagnosis” does not produce results, then the search for the cause should be continued, namely, checking the fan relay. The easiest way to do this is to dismantle the relay and install a new one of a similar model in its place.
Although the price of this device is low, you can do without purchasing a new relay at all. It’s enough just to borrow it for a couple of hours from a motorist friend who owns a VAZ 2114, and after checking it, return it back.
If after replacement the fan begins to operate normally, it means that the old relay was indeed damaged, and you will still have to buy and install a new one. If not, then you should move on to checking the temperature sensor.
Thermal sensor
Thermal sensor (also known as coolant temperature sensor, also known as DTOZH) is a device that reports the coolant temperature to the electronic system. As already mentioned, it is this that causes the fan to start and turn off depending on the temperature of the radiator. It is not surprising that a broken temperature sensor is a common reason why the VAZ 2114 cooling fan does not turn off.
Coolant temperature sensor
In this case, the system “thinks” that the liquid temperature is constantly high and does not drop (after all, the sensor is stuck at maximum), so no command is received to turn off the fan. To solve this problem, you will also have to purchase a new sensor and install it in place of the old one. If the fan starts working properly, then the sensor was the cause. If not, then the last possible malfunction remains - the electronic control unit.
Speaking about the temperature sensor going off scale, it is worth noting one very important point. If the cooling fan runs constantly, but the temperature on the dashboard is displayed correctly, then you can continue driving the car. If the fan does not turn off, and the instrument in the cabin shows boiling coolant, then trips should be stopped immediately and a full diagnosis of the cooling system should be carried out. This will help prevent engine overheating and failure.
Electronic module
As already mentioned, if all other elements of the electrical circuit are working properly, but the VAZ 2114 fan still does not turn off, all that remains is to check the last important link - the electronic module. It is worth noting that it rarely fails, but sometimes it does happen.
In this case, a solution to such a problem could be either a complete reset of all errors in the block or its flashing. Since it is quite difficult to do this at home, the best option would be to contact a car service.
ECU VAZ 2114
conclusions
The radiator fan on the VAZ-2114 is used to forcibly cool the engine and cooling system when natural cooling is insufficient. It turns off especially often if the temperature sensor is broken.
Its failure can lead to unexpected consequences, therefore, it is necessary to determine the cause of the malfunction in a timely manner and eliminate it . If the motorist is unable to do this, then it is worth contacting a car service center.
Good evening! I recently bought a car and started to look into it... And I came across one nuance!
When the temperature rises above 90 (98-105) the fan comes on, and it works tirelessly until you turn off the car!
On the highway at a speed of 100-120 at the previous temp. fell steadily to 90 and stayed at this level, and then there was a jamb!
I checked the pipes, they are all hot, the radiator is not cold either.
And there is one nuance, 3 days ago with a friend at 3 am we were driving along the highway and I noticed that when the speed was stable at 6-7 thousand and the heater was on, the speed dropped to 90.
Tell me where there might be a jamb, where to look (I’m afraid to go to the service station, they usually offer to change everything) maybe someone has come across this issue!
Mileage: 100,000 km
Relay
Often the cooling fan does not turn off due to a failed fan relay. It is installed in an additional mounting block “four”. This block is located near the front passenger's feet and is covered with a decorative trim.
It is not necessary to use a tester to detect its breakdown. It is enough to take a similar element from the owner of the same car for a couple of minutes and replace it with your own. If the fan operates normally, the relay has failed and needs to be replaced. It is inexpensive, and you can replace it yourself.
Lada 2114 2011, 89 l. With. - breakdown
Cars for sale
Lada 2114 Samara, 2011
Lada 2114 Samara, 2011
Lada 2114 Samara, 2013
Reset errors
Sometimes after repairs have been carried out, error codes still remain in the memory of the electronic control unit. They may interfere with the normal operation of the fan and may also be displayed on the on-board computer. In order to restore the functionality of the element, you need to remove them. This can be done in two ways.
1 way. To do this, you will need an OBD scanner and a laptop or smartphone with the appropriate application. Errors are reset in the following sequence:
- Connect the scanner to the diagnostic connector of the car and a laptop or other gadget.
- Turn on the ignition.
- In the program, press the READ key and press ERASE. Sometimes you need to select YES or CLEAR to clear errors in an application.
Method 2. If you don’t have a diagnostic scanner, you can use another error removal algorithm:
- Turn on the ignition without starting the engine.
- Open the hood and loosen the negative terminal of the battery.
- Wait approximately 1 minute.
- Place the terminal in place, securing it securely.
- Close the hood and turn off the ignition.
After clearing the fault codes, you need to turn on the ignition and check for errors. You also need to make sure that the fan is functioning properly. If resetting does not solve the problem, the problem may have been identified incorrectly.
You can drive with a constantly running fan, but provided that the antifreeze temperature is normal. If it is high, then you need to stop and not use the machine until the problems with the cooling system are eliminated.
