Troubles in the cooling system are the most dangerous. Without keeping track of the fluid temperature, you can leave the engine uncooled. The result is a major overhaul, since the engine will simply jam. Therefore, you need to detect the malfunction in time and try to fix it.
The cooling system on both the VAZ 2107 and the VAZ 2109 has the same scheme. The only significant difference is the type, since the nines use a sealed system. A plug with two valves is installed on the expansion tank. The inlet is triggered when the pressure drops to 0.13 atmospheres, and the exhaust is triggered when 1, 2-1, 3 atmospheres are reached. On early VAZ models, the coolant is not under such high pressure. By increasing the pressure in the cooling system, antifreeze (or antifreeze) has a high boiling point.
Troubleshooting
The most common breakdown in all vehicles is the thermostat. A sign of failure of the thermostat is the boiling of the coolant even when driving at high speed, when it would seem that the radiator has a good airflow. The reason lies in the fact that a thermostat is needed to switch the fluid circulation between the large and small cooling circles. VAZ thermostats, when they fail, leave a small circle turned on. And this is the whole system, except for the main radiator. Hence the excessive heating.
The second most popular failure is the failure of the pump (liquid pump). There is practically nothing to break in it, but the oil seal is often destroyed, through which the coolant seeps out. Sometimes bearing wear occurs, it begins to emit a terrible whistle and grinding. These are the main malfunctions of the pump, they can be determined by ear and by sight. True, sometimes the bearing collapses so that it does not make sounds, but an axial play appears.
The electric fan is the third most popular unit in which a breakdown can occur. Sometimes it stops working due to the failure of the temperature sensor responsible for turning it on. But often the cause of the malfunction is the wiring. On nines, for example, a simple fan switching circuit is used. Fuse, sensor and fan itself. The sensor is connected to ground and to the fan. So the wire that goes to the body has a considerable length and runs throughout the engine compartment. The slightest break and the fan fails.
Rapid repair methods
If the thermostat ordered to live a long time on a long journey, then try to knock on its body first. Sometimes, after exposure, the valve opens, but expect that soon it will jam again. The best option is to drain the liquid and try to puncture the thermostat to turn on the large circle. And if suddenly there is a new or working one in the glove compartment, then install it.
It is more difficult with a pump on the road, it will be easier to add water as needed. But this is if the leak is not very large. Having reached the place where repairs can be carried out, you need to replace it. On sevens, this is done quickly enough, you just need to drain the liquid, loosen the fan belt and remove the old pump. And on the nines, you will have to remove the casing that covers the timing block, loosen the belt, only after that, using a 10 key, unscrew the three pump mounting bolts.
And with a fan, everything is easier. If there is a breakdown in the sensor, then the simplest option is to close its contacts. In this case, the fan will run constantly, so after stopping the engine, be sure to turn it off, as the battery will run out. If the problem is in the wiring, then the best way to get out of this situation is to connect a fan to the battery. But if the winding of the electric motor burns out, then only a complete replacement will help.
