How to check the VAZ-2109 thermostat? Replacement of VAZ-2109 thermostat

What is the VAZ-2109 thermostat, when its replacement is necessary, what are the main signs of a breakdown, we will tell in this article. And also in our publication contains a detailed description of how to install a more advanced thermostat from the car model 2110. About its benefits will be told a little bit lower. And to start with the theory, you need to understand what device is the thermostat, what functions it performs in the cooling system of the internal combustion engine.

What is a thermostat?

As can be seen from the very name of the device, it does something with temperature. And more specifically, with its help there is a switching of liquid flows in the cooling system. And the thermostat, carburetor or injector are at the heart of the petrol injection system, it has the same composition and construction of the hull. When operating any motor, it is necessary to provide heating of the throttle assembly. And it is present in any injection system: in the carburetor, and in the injector.

The basis of any thermostat is a special plate, which is made of a material called bimetal. He reacts to changes in temperature and is able to deform because of this. This effect is based on the switching of air flows: the plate moves the valve, which is fixed by springs. Overcoming their effort, the plate moves the valve, opening the flow of fluid to the main radiator to ensure efficient cooling.

Signs of breakage

What could be the first sign that the VAZ-2109 thermostat went out of order? Of course, the engine overheats even when driving at a high constant speed. The reason - the liquid continues to circulate through a small circle, does not get a drop into the radiator. And even the inclusion of an electric fan will not help, because it's simply useless to do it. The only thing that can slightly improve the situation is the opening of the stove cock and the inclusion of a blower at the maximum speed.

But this action will not bring comfort in hot weather. The most frequent failure of the thermostat is the wedging of the sensing element in its original position (the liquid moves along a small circle). If suddenly this happened, then you need to try all methods of elimination. Even a few light strokes on the hull may well open the valve. If there is such a state of emergency on the road, then it is necessary to drain the liquid, to break all the insides of the thermostat, so that the liquid circulates only along a large circle. But will not boil, and you can get to the repair site.

Preparing for replacement

To the car was completely ready to replace the thermostat, you need to wait until the engine has cooled down to at least 40-50 degrees. On hot work, it is extremely dangerous, you can get a burn. The replacement of the thermostat with VAZ-2109 is performed quite quickly, the most complicated and tedious procedure is the emptying of the system. To do this, use two drain holes, which are located at the bottom of the radiator (the plug is twisted by hand) and in the engine block (bolt under the head for 13).

But here's what to do if the system is flooded with antifreeze, which has a fairly high cost? We must try to keep it, so that it would not be expensive to repair the car. To do this, first of all, by opening the stove cock, unscrew the yoke on the branch pipe that goes to the throttle. Through it, you need to drain the maximum possible amount of antifreeze. Yes, this procedure is slow, but it will save almost all the liquid. Only after it you can unscrew the cap on the radiator and on the engine. And do not forget to unscrew the plug on the expansion tank so that the pressure increases.

Replacement of thermostat

Old remove, install in its place a new one - this is the entire replacement procedure. But you need to carefully inspect all the pipes of the system. The thermostat VAZ-2109 is connected. Injector or carburetor in the injection system - it does not matter.

When carrying out work, pay special attention to the collars. The old ones are extremely undesirable, it is better to install new ones. And an important criterion is reliability. Worm-type clamps are very gentle: it is worth making a little more effort, as it collapses. And the ability to damage the pipe is very high. If you excessively tighten the yoke, then you can punch the rubber. But we can not tighten it too much, of course, because there will be fluid leaks. In other words, it is a double-edged sword. And a little advice: before installation it is desirable to apply a sealant a thin layer on the surface of the thermostat, which will come into contact with the nozzle.

The better the thermostat from the "tens"?

Of course, we are not talking about the models that were put on the first issues of the "dozen". The VAZ-2109 thermostat (carburetor) is very similar to the one that was installed in the first models of the "dozen". But now we are talking about more modern models. Their main advantage is that the number of clamps is minimized. But the thermostat is not mounted to the engine block using a short branch pipe. The body is screwed to the engine assembly using two pins. The temperature sensor is screwed into the thermostat, therefore, the second hole must be muffled.

In addition, when installing the thermostat from "tens" to "nine" there is an opportunity to save a little, because you can only change the sensitive element. Among the passive benefits - the release of space under the hood. The body of the thermostat becomes five centimeters shorter, which makes it possible, without difficulty, to reach, for example, the adjusting nuts of the clutch cable.

Can the thermostat 2110 be set to "nine"?

In part, this question was answered in the last paragraph. Yes, you can install the VAZ-2110 thermostat at 2109, and it does not matter at all, the "nine" carburetor or injector. In fact, starting with the "eights", the engines are used the same. What can I say, even on modern "Grants" install the engine, which is used at the G8 and N9 since the 80s. Progress, do not say anything. Of course, instead of the carburetor, there is now a more modern injector injection system, which by European standards was outdated about 5-10 years ago. And practically all nodes are interchangeable. There are minor differences, improvements, but this does not change the whole picture.

Refueling of cooling system

To fill the liquid and pump the cooling system, it will take several minutes. First of all, check whether all the nozzles are securely installed, whether all the clamps are tightened. Then see if the plugs on the ICE and the radiator are in place. If not, install them. Now you can open the stove cock and pour liquid into the expansion tank. The gurgling stopped - closed the cork and started the engine. Wait until the operating temperature is about 90 degrees. If necessary, top up the fluid in the reservoir. It is necessary that its level be between the bottom and top marks.

Conclusion

Work with the thermostat is not very much, but how to check the VAZ-2109 thermostat, you know perfectly well. Dip in boiling water, if the valve opens, then the element is defective. It can not be repaired, only a complete replacement will help. If you want to improve the performance of your engine, then, of course, it is more reasonable to mount the thermostat from the "dozen". True, there may be minor difficulties, for example, the motor will not pick up the temperature. In this case, it is worthwhile to reconsider the connection of the system elements. In the rest, thanks to this modernization, heat exchange only improves.