How to check the VAZ-2109 thermostat? Replacing the thermostat VAZ-2109

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

What is a VAZ-2109 thermostat, when it needs to be replaced, what are the main signs of a breakdown, we will tell in this article. And also our publication contains a detailed description of how to install a more advanced thermostat from a model 2110 car. Its advantages will be discussed a little lower. And it’s worth starting with a theory, you need to figure out what kind of device the thermostat has, what functions it performs in the cooling system of an internal combustion engine.

What is a thermostat?

As you can see from the very name of the device, it does something with the temperature. And more specifically, with its help, the fluid flows in the cooling system are switched. Moreover, the thermostat, carburetor or injector are at the heart of the gasoline injection system, have the same composition and body design. During operation of any motor, it is necessary to provide heating of the throttle assembly. And it is present in any injection system: both in the carburetor and in the injector.

The basis of any thermostat is a special plate, which is made ofmaterial called bimetal. It reacts to temperature changes and is able to deform because of this. The switching of air flows is based on this effect: the plate moves the valve, which is fixed by springs. After overcoming their force, the plate moves the valve, opening the way for liquid flow to the main radiator for effective cooling.

Signs of breakdown

What could be the first sign that the VAZ-2109 thermostat is out of order? Of course, the engine overheats even when driving at a high constant speed. The reason is that the liquid continues to circulate in a small circle, not a drop gets into the radiator. And even turning on the electric fan will not help, because doing this is simply useless. The only thing that can slightly improve the situation is opening the stove tap and turning on the interior airflow at maximum speed.

But such an action will not bring comfort in hot weather. The most common failure of the thermostat is the jamming of the sensitive element in its original position (the liquid moves in a small circle). If suddenly this happened, then you need to try all the methods of elimination. Even a few light blows to the body may well open the valve. If such an emergency happened on the road, then you will have to drain the liquid, break all the insides of the thermostat so that the liquid circulates only in a large circle. But it will not boil, and you can get to the place of repair.

Preparing for replacement

To carwas completely ready to replace the thermostat, you need to wait until the motor cools down to at least 40-50 degrees. It is extremely dangerous to work on hot work, you can get burned. The thermostat is being replaced on the VAZ-2109 quite quickly, the most difficult and tedious procedure is emptying the system. To do this, you need to use the two drain holes that are located at the bottom of the radiator (the plug is unscrewed by hand) and in the engine block (13 head bolt).

But what to do if the system is flooded with antifreeze, which has a rather high cost? We must try to save it so that it is not expensive to repair the car. To do this, first of all, by opening the stove tap, unscrew the clamp on the pipe that goes to the throttle valve. Through it, it is necessary to drain the maximum possible amount of antifreeze. Yes, this procedure is slow, but it will allow you to save almost all the liquid. Only after it can you unscrew the plug on the radiator and on the engine block. And do not forget to unscrew the cap on the expansion tank to increase the pressure.

Replacing thermostat

Remove the old one, install a new one in its place - this is the whole replacement procedure. But you need to carefully inspect all the pipes of the system. A VAZ-2109 thermostat is connected. Injector or carburetor in the injection system - it doesn't matter.

When carrying out work, pay special attention to the clamps. It is highly undesirable to use the old ones, it is better to install new ones. Moreover, reliability is an important criterion. Worm-type clamps are verygentle: it is worth making a little more effort, as it collapses. And the possibility of damaging the pipe is very high. If you tighten the clamp too much, you can break through the rubber. But, of course, it is impossible to tighten it weakly, as fluid leaks will appear. In other words, it's a double-edged sword. And a little tip: before installation, it is advisable to apply a thin layer of sealant on the surface of the thermostat, which will be in contact with the nozzle.

What is the best thermostat with "tens"?

Of course, we are not talking about those models that were put on the first releases of the "ten". The VAZ-2109 thermostat (carburetor) is very similar to the one that was installed in the first ten models. 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 attached to the engine block with a short pipe. The housing is screwed to the engine block using two studs. The temperature sensor is screwed into the thermostat, therefore, the second hole must be plugged.

Besides, when the thermostat is set from "tens" to "nine", it becomes possible to save a little, because only the sensitive element can be changed. Among the passive benefits - freeing up space under the hood. The thermostat housing becomes five centimeters shorter, which makes it possible to easily reach, for example, the adjusting nuts of the clutch cable.

Can the thermostat 2110 be set to "nine"?

This question was partly answered in the last paragraph. Yes, you can install a VAZ-2110 thermostat on 2109, and it doesn’t matter at all whether the “nine” is carburetor or injection. In fact, starting with the "eights", the engines are used the same. What can we say, even on modern "Grants" they install an engine that has been used on "eights" and "nines" since the 80s. Progress, nothing to say. Of course, instead of a carburetor, there is now a more modern injection system, which, by European standards, was outdated 5-10 years ago. And almost all nodes are interchangeable. There are minor differences, improvements, but this does not change the whole picture.

Refilling the cooling system

It will take you a few minutes to fill in fluid and bleed the cooling system. First of all, check whether all the pipes are securely installed, whether all the clamps are tightened. Then see if the plugs of the engine block and radiator are in place. If not, then install them. Now you can open the stove valve and pour liquid into the expansion tank. Stopped gurgling - closed the cork and started the engine. Wait until it warms up to operating temperature - about 90 degrees. Add fluid to reservoir if necessary. It is necessary that its level be between the lower and upper marks.

Conclusion

There is not much work with the thermostat, but you know very well how to check the VAZ-2109 thermostat. Dip in boiling water, if the valve opens, then the element is working. It cannot be repaired, only a complete replacement will help. If you want to improve the performance of your engine, then, of course, it is wiser to mount a thermostat from the "tens". True, minor difficulties may arise, for example, the motor will not gain temperature. In this case, it is worth reconsidering the connection of system elements. Otherwise, thanks to such modernization, heat transfer is only improving.