Engine cooling fan. Engine Cooling Fan Repair

You do not need to talk about why you need a fan for cooling the engine and what is fraught with its malfunction. As can be understood from the name, its main purpose is to cool the motor while driving the car. Quite often this device fails, the reasons for this mass, let's take care of the main points of repair.

Engine cooling fan: operating principle

First of all, you need to understand how this device works. Since we are dealing with a whole set of mechanisms and devices that allow to remove heat from the engine into the environment, this is a rather complex system. In this article we will talk about air cooling, rather than liquid cooling. The fan is installed between the cylinders. It is driven by a V-belt drive directly from the crankshaft pulley.

On the engine there are special covers that allow you to direct air flows to those parts of the motor where the temperature is maximum. The fan's power consumption of the engine is 8-9% of the maximum. Do not forget that it turns on and off automatically when a certain temperature is reached. For example, the VAZ-2110 engine cooling fan starts working at a temperature of 95 degrees Celsius and above. If this does not happen, then you need to look for the cause and eliminate it.

Problem Search

As practice shows, it is not always so easy to find the cause of the malfunction, as it may seem. The most common fault is failure at the right time. That is, the engine has heated to the maximum temperature of 95-99 degrees, and the device does not turn on. In this case, we need to open the hood and find the thermal switch, as a rule, it is located on the side of the radiator. It can be replaced or attempted to repair.

Of course, breaking the thermal switch is not the worst thing that can happen. The failure of the fan motor is much worse. First, the repair is more time consuming, and secondly, it can not be of use. But, first of all, you need to check the fuse of the electric motor, as it could fail. If it's OK, then try the following. We disconnect the wires from the thermoswitch and connect them to each other, turn on the ignition. The fan must earn. Thus, the failure is not caused by an electric motor, but by a switch.

Tools for repairs

So, you checked everything, we went through each fuse and already reached the relay, but the problem did not dare. Therefore, the engine cooling fan does not work, you need to remove and repair the motor of the device. For this we need a minimum set of tools. We take the end head for 10, this is practically everyone in the garage, it will also require an extension cord, medium or long.

It is desirable to have a ratchet. If you do not have one, you can take a regular wrench. In addition, prepare rags, since this work is dusty. It's better to have a flat and cross-head screwdriver at hand, as well as a set of keys. Here, in principle, and everything, then you can go directly to the dismantling of the device. By the way, before you start working, it is desirable to turn off the battery mass, that is, "minus".

Remove the engine cooling fan

After we have the necessary tool, the machine is installed on a horizontal surface, and the ignition is turned off, you can start dismantling. First, you need to completely disconnect the wires going to the fan. First, pull out the plug of the motor, and then the wires of the temperature sensor. Only here there is one nuance, you need to disconnect both ends, that is, from the sensor and the fan.

Then the engine cooling fan is ready for removal. But before that, you need to unscrew all the bolts. First we twist two of them, those that are placed above and below, as a result, we get a free left side. As for the right one, there is only one bolt in the center. The next step: we take the center of the fan and drag ourselves, you need to get it without any effort from under the hood.

A little about the repair

It is worth noting that the device is completely collapsible. Therefore, its replacement must be done assembled. However, in some cases it makes sense to perform self-repair. For example, the winding in the motor was closed. There are problems even easier, such as a blown fuse. It's enough just to change the part, and everything will work.

It is worth noting that the engine cooling fan, the price for which today is rather large, should be periodically cleaned. After we remove it, you need to clean it with a brush from various kinds of pollution, it can improve its productivity. Since this device has several speeds, a special resistor is used, through which current is supplied. There is a fuse, which quite often burns out, because of this, in fact, and can not turn on the fan.

We check the electric motor and wiring

During the operation of the car, the wires are oxidized, so that the contact becomes worse. Therefore, before you change anything, you need to look at the condition of the wires. Disadvantages immediately need to be changed or cleaned with a brush. But if the problem still remains, then you have to check the electric motor of the fan. Make it simple enough, now you'll find out how.

If the engine cooling fan does not turn on, do the following manipulations. First you need to disconnect the plugs of the wires, and then install a jumper between the black-and-red wire and the battery positive. Next, use the second jumper to connect the brown wire terminal and the minus battery. After that, turn on the ignition, the fan should work. If this does not happen, then we have a faulty motor. In this case, you can try to perform repairs, but it will take a long time, and it is not known what the result will be.

The engine has warmed up and the fan does not turn on.

This is probably the most common problem. About this we have already said a little at the beginning of the article, but here we need to understand in more detail. For example, the cooling fan of the engine "Kalina" should be switched on at a temperature of 99 plus-minus 2 degrees. Switch off the device should be at a temperature of 92 plus or minus 2 degrees. If this does not happen, for example, turns on, but does not turn off or vice versa, you need to repair or replace the thermal switch.

To check whether this is the case, you can try to start the engine, allow it to heat up to the operating temperature, carefully unscrew the cap of the expansion tank and put the thermometer there. If the mark has stopped between 92 and 99 degrees, then the first speed should start, if at 99-105, then the device should run at the second speed. If any deviations were noticed, then, most likely, a fuse burned on the resistor.

Repair of rotor and brushes

Sometimes all the blame is banal dirt. For many years the car has been operated and its systems are not being cleaned. As a result, we get a malfunction. As an example, let's look at the VAZ-2110 engine cooling fan. To perform repairs, you need to bend the motor cover and look at the general condition of the equipment. As a rule, replacement of brushes is required, that is caused by the environment of their operation. They quickly wear out, get dirty and do not cope with their work.

As for the rotor, then there are few options. The first thing to check is whether the winding is working. If everything is in order, then we can rejoice, we do not have to change it. If there is an open or a short circuit, then we start to sort through each turn and look for where the problem is. Also you need to clear everything from dirt, and there it will be, believe me, a lot. To do this, you can use a brush for metal, as well as rags. It is allowed to use solvents without chemically aggressive components.

Conclusion

Let's sum up. We figured out how to fix the engine cooling fan. If you can not do it yourself, then you need to go to the service, but the pleasure is not from the cheap, and you can take 5000-10000 rubles. Of course, if at least once every few years, lubricate rubbing surfaces, clean the blades from dirt, and change fuses, many problems can be avoided. Nevertheless, no one is immune from breakage, but now you know how most faults are eliminated, especially since repairing the engine cooling fan is not so difficult. You just need to make some effort, have the necessary tools and new parts. If you do it yourself, you can save up to 60-80% of the funds.