The VAZ-2107 cooling system is leaky, unlike models 2108 and newer. But this does not mean that its functioning is much worse. True, there is one small drawback - it is necessary to manually pump the system to get rid of air jams in it. It is not difficult to do this, but you need to take into account small tricks, which will be described below. Each car owner should know what elements the cooling system consists of, as well as what are the main symptoms of malfunctions.
Cooling thermostat
You can even say that this is the main element, since it allows you to switch fluid flows between small and large circles. To put it bluntly, the big circle differs from the small one only in that the radiator is involved in the work. When the engine is started, the fluid circulates in a small circle. So it will warm up faster and reach operating temperature (82-87 degrees). A stove is also included in this circuit so that in the car's interior it is possible to warm up faster in winter.
It is worth considering that the VAZ-2107 cooling system is also connected to the throttle. The injector must be warmed up so that condensation does not form. It is such a distribution over the channels that is made by the thermostat, which is made of a bimetallic plate. He has several drawbacks - in case of breakdown, circulation occurs in a small circle (the engine boils), it is impossible to repair it, to replace it, it is necessary to drain the antifreeze from the system.
Fluid pump
It is installed in front of the car. This is a fairly convenient location, unlike later models. Most importantly, the drive is carried out from the generator belt, which is not covered by covers. But the pros end there, the disadvantages begin. So, the liquid pump has inputs and outputs to which the nozzles are connected. And each joint is a theoretical place of fluid flow. The tightness of the joint may be impaired at any time.
The bearing mounted in the pump housing is not credible either. Often it breaks, which causes an unpleasant whistle. As with replacing a thermostat, it is necessary to completely drain the fluid from the system when removing the pump. The VAZ-2107 engine cooling system, as stated, has two circuits. And the liquid pump allows for the movement of antifreeze along the nozzles. In this case, cooling is much more effective, because the liquid does not stand still.
Electric fan
We are talking about the fan that is installed on the cooling radiator. It works quite rarely. It turns on only when the temperature at the radiator outlet is exceeded. At this point, a sensor is installed, or to be more precise, a thermal switch. It consists of a bimetal plate, which at a certain temperature value is deformed, changing its geometry. This closes the contacts associated with this plate mechanically.
It is worth noting that the VAZ-2107 cooling system, whose malfunctions can be eliminated quickly enough, is still not very perfect. The sensor, according to the manufacturer, is capable of switching high currents, while it has an impressive resource. But it is better that there is a degree of protection - switching on should be done using an electromagnetic relay, which is controlled by a sensor. So you can increase the resource many times over. In addition, it is necessary in the cabin to have a button connected in parallel with the sensor. With its help, you can force the fan.
Expansion tank
Installed on the body in the engine compartment. It is necessary to maintain the liquid level in the engine cooling system. When heating of antifreeze occurs, it expands, increases in volume. When cooling, the reverse process occurs. With all this, it is necessary that the liquid always, regardless of temperature, stay at the same level. It is for this that a tank is provided.
Its functions are the same as those used in the heating structures of houses for the operation of boilers. Without it, the VAZ-2107 cooling system will not be able to work. The carburetor also needs heating, so the height of the tank is the same as that of the fuel injection device. Please note that the expansion tank is marked with the minimum and maximum fluid levels. It is necessary to adhere to the golden mean.
Branch pipes
These are pipes made of durable rubber. Inside there is reinforcement, which improves their parameters. They serve to circulate fluid through the circuits. The nozzles are fixed using metal clamps of a worm type. But this type of fastener has a big drawback. If you tighten it slightly, then the liquid from the nozzles will gradually come out, a leak will appear. If tightened tightly, the collar or pipe may collapse.
Therefore, when tightening, attention should be paid to physical effort. And do not forget that the service life of the nozzles with a mileage of 30,000 kilometers per year is not very long. There is a need for replacement once every 2-2.5 years. By this time, temperature changes and exposure to moisture, dust leads to the fact that the surface of the pipes is covered with microcracks, becomes brittle. Rubber, no matter how high-quality it is, wears out and collapses. In addition, a leak may occur and, as a result, insufficient engine cooling.
Cooling radiator and stove
Two more elements that make up the VAZ-2107 cooling system. An injector or a carburetor - it does not matter what is in the fuel supply system. The difference between these two radiators is only in size and shape. There is also one small detail - the connection from the expansion tank to the main radiator is connected. Therefore, he has two pipes at the entrance. Both radiators have fans. One contributes to the heating of the cabin, and the second allows for additional airflow for effective cooling.
From this we can conclude that if the fan fails on the main radiator, you need to open the faucet of the stove and turn on the blower. In summer, of course, it’s not very convenient, the effectiveness of this action is much lower, but it allows you to avoid boiling liquid in the system. Consequently, the probability of engine damage is extremely small.
Cooling system maintenance
In order for the VAZ-2107 cooling system to function normally, it is necessary to carry out its timely maintenance, replacement of elements, as well as flushing. When installing new nozzles or other parts, the amount of deposits in the system decreases, but do not forget that there is a lot of garbage in the unit's shirt and radiators. These are small particles of dust that enter the liquid and settle on the walls. Especially dangerous is the use of water as a cooling fluid. It leaves a large amount of deposits that are difficult to dispose of.
Flushing system
Rinse regularly. It is made simple, just apply a special solution designed for this purpose. Pour it into the system, start the engine and let it warm up to operating temperature. After that, turn off the engine, drain the solution and repeat the procedure 2-3 times, just use clean water. Solutions intended for washing are very aggressive and can destroy rubber and metal with prolonged contact.
Please note, before draining the liquid from the system, you need to wait a while, so that the temperature drops to a safe value - about 50 degrees. If there is damage, then repair. The VAZ-2107 cooling system has two drain holes - on the radiator and cylinder block. And do not forget to open the faucet of the stove when flushing, so that the solution gets into the radiator. The price of this procedure at the service station ranges from 500-700 rubles. This is not so much compared to repairs.