From the first days of the creation of an internal combustion engine, it has had one main problem - increased heat release. This phenomenon is accompanied by overheating of the engine, the resource of which can quickly be reduced. When the engine overheats, deformation of many parts can occur. piston group, damage to oil seals, seals and bearings, as well as ignition of fuel in the fuel supply system.
The first cooling system washed the walls of the engine with some water. When heated, the water evaporated and "took" a certain amount of heat from the engine. Later, more advanced, closed engine cooling systems appeared, the effect of which was enhanced with the help of cooling fans.
Initially, the fan was attached to the water pump or. Spinning up, the fan worked constantly and cooled the engine at a given level for the entire period of operation. The disadvantage of such a fan is that its rotation does not stop even in winter, when the engine warms up longer than in summer. Thus, warming up took much longer.
All the shortcomings of pump fans were blocked by an electric drive. Electric fans appeared in the second half of the 20th century and markedly improved both the cooling and heating of the engine to operating temperature.
The device and principle of operation of the cooling fan VAZ 2109
The fan consists of an electric motor, on the shaft of which there is a wheel with blades and a special casing with fasteners. The casing is designed to mount the fan and is designed so that the fan only draws air from the front of the vehicle. The casing is made of metal, and its fastening is carried out to the car radiator.
The fan works only at certain coolant temperatures and does not allow the temperature to rise above the norm. When the coolant in the radiator reaches a certain temperature (87 - 90 degrees Celsius), the temperature sensor located on the radiator is activated and closes electrical circuit cooling fan. The fan starts rotating and cools the motor.
After the temperature drops below the set marks, the sensor opens and disconnects the electrical circuit of the cooling fan. This cycle continues throughout the operation of the fan and ensures reliable cooling of the engine during normal operation.
Malfunctions and replacement of the cooling fan
The main malfunction of the fan is considered to be its failure in operation. It manifests itself in the rise in the temperature of the coolant above normal. And as soon as the hood is opened, it turned out that the fan did not work.
Troubleshooting begins with checking the sensor. To do this, the wires are pulled out of the sensor and connected to each other (the ignition must be on). If the fan starts to rotate, then the problem was in the sensor, if not, then the problem touched the fan one hundred percent.
Failure of the fan is usually associated with a malfunction of the electric motor. Only an electrician can repair an electric motor, so in your case, you need to take it in for repair or replace it with a new one. The removal and installation process is described below.
Video - Replacing the fan switch sensor VAZ 2114
Procedure for replacement
1. Open the hood and disconnect the battery terminal.
2. Disconnect the plug with wires from the connector leading to the fan.
3. Unscrew the fan mounting bolts and remove it.
4. Before installing a new fan, check its operation by connecting it directly to the battery. If it works, install it in the reverse order of removal.
This completes the replacement of the cooling fan.
Scheme for switching on a VAZ 2109 fan using a relay
It is not difficult to force the VAZ 2109 fan to turn on, you just need to think a little and understand the principle of operation of the entire system. The need for radiator cooling arises in those moments when you move through traffic jams (and it doesn’t matter at all whether this happens in winter or summer). In hot weather, of course, overheating occurs more.
But with a long movement in the starting mode and an instant stop, the antifreeze in the cooling system simply boils. Today we will consider the reasons why the VAZ 2109 fan does not turn on in automatic mode, the temperature sensor is replaced, and we will also draw up a small scheme for forced airflow start. The latter turns out to be useful, since the quality of thermal switches leaves much to be desired.
Why doesn't the electric fan work?
There are not so many reasons:
- The motor winding burned out.
- The thermal switch has failed.
- Destruction of electrical wiring.
So, what to do if the fan suddenly stops turning on? First of all, open the valve of the stove, this will increase the circle of circulation of the coolant. Do not forget to turn on the blower of the stove radiator so that it cools faster.
When the temperature starts to drop a little, turn off the engine. Open the hood and before you is not a very pleasant picture - the antifreeze is gone, half of the compartment is wet. It is necessary to add liquid to expansion tank. If it happens in the summer, then you can fill in the water (the main thing is to change it to antifreeze before winter).
Check the operation of the electric motor - disconnect the connection block and directly supply power from the battery to it. Is the propeller spinning? So, everything is fine with the winding, install the block in place. Only the sensor-switch is responsible for turning on the VAZ 2109 fan on later versions.
To check it, you need to remove two wires from it and connect them. If the rotor began to rotate, then the malfunction lies precisely in the sensor. The way out of this situation is to continue moving by connecting these two wires. It is not necessary to isolate them, since the switching on of the VAZ 2109 fan is controlled by mass (if a bare wire catches on a part of the body, then it's okay).
And the third reason is a broken wire. There are two wires going to the VAZ 2109 fan sensor: directly from the fan and ground (body). If there were no problems before, then try to make a reliable ground, since by default in nines the negative wire from the fan sensor goes towards the fuse box and is lost there.
Find a place near the radiator where you can connect the negative power cable. That's all the malfunctions that may lie in wait for you. Now it's worth talking about the useful button for forced airflow.
How to install the VAZ 2109 fan switch button correctly
There are two options - through a relay or using only one switch. The relay connection diagram is simple - you need to connect two wires in parallel with the sensor. Both of them should go to the normally open outputs of the electromagnetic relay. This circuit avoids the presence of high current in the circuit breaker.
Two thin wires must be brought under dashboard and connect to the contacts of the button (or switch). Thus, a control element for a low-current winding of an electromagnetic relay is installed in the passenger compartment, and all high-current circuits are located under the hood.
And now, if the VAZ 2109 fan sensor fails, you just need to press the button to cool the engine. For this purpose, a standard relay with normally open contacts is used. Similar are installed on the light, drives of electric motors. Its price in the store is about 50-70 rubles.
The cost of the fan switch on sensor is about 100 rubles. As a result, having spent a couple of hundred and half an hour of time, you will make a reliable system that will not let you down in a difficult moment.
I will say on my own: after it boiled in traffic jams a couple of times, due to the fan not turning on, I had to install a conventional switch and relay. Unfortunately, there was nothing but a stove fan switch from the six, so I put it on. And now, as soon as I approach the traffic jam, I just turn on the fan. And turn it off when I stop. It does not affect maneuverability and speed. Even taking into account that the carburetor nine (idle holds 900-930), there are no jerks or attempts to stall.
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So, this idea came up, why not move the fan from the engine compartment to somewhere else.
Why transfer, change what they did at the AvtoVAZ plant?
And all in order to add at least a little free space under the hood. In connection with the installation of 16kl engine space under the hood was quite small. With minor repairs, you can’t stick your hand anywhere ...
But, to a greater extent, the process of the fan operation itself strained.
Let me remind you that with a carburetor internal combustion engine, the fan was connected to a temperature sensor located on the top of the radiator. Turning on the fan depended on the sensor (90-100 degrees). In my case, the sensor is from the classics, the operating temperature is from 90 degrees.
Injector - fan operation from brains (I have January). There is a temperature sensor on the thermostat, from which a signal is sent to the brains, and when it reaches the desired temperature, the brains turn on the fan. In general, everything is clear here. But for some reason, the inclusion from the brain did not always occur at 105 degrees. It has been higher. In traffic jams, this was very disturbing. I had to turn on the oven! Antifreeze was boiling ... Therefore, it was decided to rebuild the structure.
I saw the idea of two fans on the front for a long time on the Internet. Many people buy fans from the new Niva (21213 ...) or from ChevroletNiva, but this is still a little expensive for me. here is a photo of fans worth over 3000 rubles.
new from fields
It was decided to weld two fans myself.
First, remove the old fan along with the box.
I had to suffer with him a little, did not get out. It was possible to remove the protection, lift up the muzzle and pull it out from below, but ... I just unscrewed the top pipe going to the radiator, removed it and pulled the fan up.
What to do with him, how to be? ..
... By a lucky chance, my friends got me two boxes for a fan from the classics and the motor itself with blades.
I tried on a box from 2108
box from 2108
as written - from the classics
Box 2103 made more or less elegant and is more suitable.
The motors are the same, both on the classic and on the nine - from the VAZ 2103. Loposta too.
We remove the blades so that they do not interfere and to paint them. For one thing, we clean the engine from oxidation, and lubricate it.
Here is the schematic.
how to disassemble.
Bought poisonous paint. Fluorescent.
Also, black paint was found.
There is no need to describe the welding process ...
After welding, we try on the car, the corners and edges of the fan boxes interfere. We take a grinder and do everything the way we want.
We try on, sits perfectly.
Now we take a drill, a 6.5 drill and drill holes to fix the structure on the TV. Be careful not to damage the radiator!
Next, as everything fits, we paint the structures in several layers.
Oh yes, I had to cut off the ears of the radiator grille, well, they interfered a little. Then we put the grate, it's not so important)
Dried up
updated telly
collect, install.
The electrical wiring issue.
We will connect the fans in such a way that one works from the sensor on the radiator, the other from the brains.
Joking around, he helped me with the scheme besxes.
I sent you this diagram.
I changed it a little, but in fact, everything remained the same as he sent.
To connect we need:
Pads father / mother;
wires;
relay 4-pin;
fuse box, wire terminals;
duct tape and some brains.)))
