VAZ-2107. Fan switch: installation, repair, replacement
Most owners of cars VAZ-2107faced with the problem of engine overheating due to the late inclusion of the radiator fan. Such a malfunction poses a serious threat not only to the cooling system, but to the entire power unit. Increasing the coolant temperature to critical values can disable the head gaskets of the cylinder block, the valve cover, and cause jamming of the moving parts of the motor.
Most often the radiator fan does not workbecause of problems with the sensor of its inclusion. This can be both a banal absence of contact on the connectors, and the failure of the device as a whole. In this article, we'll talk about what measures can be taken if the VAZ-2107 sensor on the fan switch has lost its efficiency, and also consider the process of its verification and replacement.
Signs of engine overheating and precautions
If you, while driving a car,find that the arrow on the device indicating the temperature of the coolant has shifted to the red sector and continues to deflect towards the increase, it will be better to stop at the roadside and immediately turn off the engine. If this is not done, antifreeze or antifreeze will simply boil and try to break out, violating the tightness of the system. Continue movement in this situation is quite dangerous. Having stopped, it is necessary to check up working capacity of all elements of system of cooling and to establish the reason of an overheat. Further, if possible, it must be eliminated. And if this is not possible, tow the vehicle to the nearest service station.
What's wrong with the fan?
Suspected of overheating faulty fancooling radiator, first check it for operation. It is not difficult to do this. Disconnect an electric socket from the electric motor, and lead to its contacts electricity from the accumulator. In this case, do not mix the polarity!
Further verification
Further testing should be carried out according to the scheme"From simple to complex". It is almost impossible to diagnose wiring without the appropriate tools and skills. The situation with the relay is similar. Check it yourself is unlikely to work, especially in the field. The only thing that can be done is to pull out a similar device from an adjacent socket or another car and insert it into the corresponding connector. Earned - the reason is set, the fan does not work - go ahead.
With the fuse test, there is no problemwill arise. We find the necessary insert in the assembly block, we check it with a conventional tester or a homemade probe made of two wires and a lamp, and the result is obvious. If necessary, change the fuse and continue driving. But if this time you and I were mistaken, the problem should be looked for in the fan switch.
Features of the cooling system in different modifications
Before starting to diagnose the sensor, itsNeed to find. The fact is that in carburetor "sevens" and a car with an adjustable fuel injection, it is in different places. Moreover, for injection machines VAZ-2107, there is no sensor for turning on the fan as such. Its functions are performed by the DTT (the coolant temperature sensor). Let us consider in more detail the arrangement of these devices in carburetor and injector "sevens".
Where is the fan switch?
At all out-of-date modifications of the "classic" sensoris located on the cooler housing. To be precise, the lower right. From the outside it looks like a brass nut on the "30" with two contacts withdrawn. Raise the hood, look at the back of the radiator - you will definitely see it. The principle of the sensor is very simple. The thermoelement reacts to the temperature rise, closes the contact, and the fan is energized. In vehicles with controlled fuel injection, the fan is activated by the command of the electronic unit based on the data received from the sensor. In other words, the ECU itself controls all processes. But where is the fan switch on the injector "sevens"?
Checking the sensor
Now let's talk about how to test the sensorfan switching (VAZ-2107). And start with the carburetor engine. Here everything is very simple. All you need to do is disconnect the wires from the sensor. To do this, remove the electrical connector from its terminals. To determine if the device is OK, turn on the ignition and close the contacts on the connector. If the whole thing is in the sensor, the fan will turn on.
It can also happen that the switching devicethe fan reacts incorrectly to the temperature. In other words, the mechanism of closing contacts works, but at a greater value. Thus, for VAZ-2107 carburetor machines, the fan switch must close the circuit when the coolant reaches a temperature of 92 degrees, and open at 87 ° C.
For engines with controlled fuel injectionthe verification process is slightly different. Since the injector auto VAZ-2107 has no fan switch, it is necessary to check the temperature controller. But first, you should inspect the presence of voltage on the connectors of the connector. Take the tester and turn it on in the voltmeter mode. Minus the wire of the device close to the "mass", and connect the positive to the terminal "A" on the connector. Turn the ignition on. The tester should show a voltage of at least 12V. If its value is reduced, the problem should be sought in the control unit. But if the voltage is ok, unscrew the temperature controller from the nozzle for further testing.
Checking the sensor is to measure itelectrical resistance at different temperatures. Put the tester into ohmmeter mode and measure the resistance on its contacts. It is noteworthy that it grows and falls inversely proportional to the temperature of the cooling liquid (20 ºС - 3,5 kΩ, 40 ºС - 1,5 kΩ, 80 ºС - 340 Ohm, 90 ºС - 250 Ohm). During the resistance measurement, the controller can be heated by placing it in a hot water tank. The temperature of the fan switch (VAZ-2107, injector) for different firmware versions of the computer can be 92-95 ° C. Its resistance is close to zero.
It should be noted that the inclusion sensorsfan and coolant temperature are not subject to repair. Therefore, if the slightest fault is detected, they must be replaced. Consider the replacement process for each of the engines separately.
Process of replacement of the gauge on the carburettor engine
Here the process may seem more complicated. After all, given that the sensor is located at the bottom, you have to drain the coolant. And for this you need to look for an observation pit, remove the engine protection, etc. But you can not do this. It is enough just to quickly wrap the new sensor in place of the old one. Naturally, a little cooling liquid will pour out, but its amount will be limited to 20-30 ml. In addition, you can always place a correctly cut plastic bottle under the joint.
So, prepare a new sensor and a wrench for"thirty". Disconnect the wires from the device. Carefully turn off the sensor with a wrench. Continue twisting it by hand, pressing it against the radiator housing. When the sensor comes off the thread, the hole can be clamped with a finger, and the other hand begins to screw in the new element. Do not manage to lose the sealing ring, which is worn on the threaded part of the device. That, in fact, the whole process. It remains to connect the wires to it, run the power unit and check whether everything works.
Replacement of the fan switch: VAZ-2107 (injector)
In the injector motor for replacing the drain sensorcoolant is not needed. It is located high enough, so its outflow will be minimal. For replacement, a new temperature sensor and a key for "19" are required. First, disconnect the connector, then unscrew the old controller and screw it into its place obviously serviceable. Connect the power and start the engine. If done correctly, the fan is guaranteed to work.
Some useful tips
Before powering off the sensors, especially"Seven" with injector motors, it is recommended to remove the minus terminal from the battery. When choosing the sensors to turn on the fan or coolant temperature, it is better to give preference to branded factory products. After the replacement, be sure to check the tightness of the threaded connection. If necessary, use a heat-resistant automotive sealant.
