Malfunctions of the engine cooling system and how to fix them

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

This article will tell you about the malfunctions of the internal combustion engine cooling system, as well as instructions for their elimination. Often there are problems in which the temperature of the liquid is kept at 0 degrees or when it reaches the red mark very quickly even in cold weather. Sometimes it happens that even in summer the arrow does not reach the value of 90 degrees. This is the operating temperature for an internal combustion engine. You will learn about the causes of these malfunctions.

The most common cause of overheating

Often an element such as a thermostat fails. It is he who is the reason that the arrow is either below the working value, or above it. It is not worth delaying the elimination of this problem, since the operation of the engine in this case is abnormal, therefore, its resource is significantly reduced. This can lead to disruption of the crank mechanism, piston group, valves. Therefore, you must be aware of system malfunctions.engine cooling and how to eliminate them so as not to overload the motor.

It is worth noting that driving in the winter without a stove is simply wildness. But this is a trifle, given that the engine wears out very much, and also “eats” a lot of gasoline. The cost of fuel at gas stations is constantly rising. Consequently, the cost of gasoline increases.

Symptoms of broken thermostat

You don't need to have seven spans in your forehead to eliminate this breakdown in a timely manner, as well as to diagnose the system. As a rule, when the thermostat breaks, the circulation of the coolant changes. On domestic VAZ cars, for example, if the thermostat malfunctions, the antifreeze continues to circulate in a small circle. It also enters the heater core. We can say that the main malfunctions of the engine cooling system are in the thermostat.

For this reason, even when driving at high speed, antifreeze does not enter the main cooling radiator, as a result of which the temperature inside the engine jacket rises sharply. In some foreign-made cars, the thermostat is jammed in a position in which the antifreeze continues to circulate in a large circle. In the summer, such a breakdown can not be immediately noticed. But in winter, it immediately pops up, since the engine will not gain sufficient temperature for operation. It will warm up very slowly.

Why can a motor overheat?

A lot of heat is given off by the coolant in the radiator, therefore, it is impossible to warm up the antifreeze to operating temperature. There is a malfunction in the thermostat for several reasons. Often this is the use of antifreeze, the resource of which has long been exhausted. Scale forms, which gradually settles on the elements of the thermostat. And then there is a violation of the work of all components of the system.

A similar malfunction can be caused by pouring water into the engine cooling system. Therefore, it is necessary to change the liquid in the system as often as possible, do not pour water from the tap. It is worth noting that the antifreeze resource is approximately 80-90 thousand kilometers. Therefore, when replacing a pump that has a similar resource, it is advisable to flush the entire cooling system, as well as replace the antifreeze. In many ways, malfunctions of the VAZ-2106 engine cooling system are similar even to those that appear on foreign cars.

Diagnostic thermostat

Determining a thermostat malfunction can be quite simple. Start and warm up the engine first. After warming up, touch the pipes that go to the radiator. If they are cold, then no coolant enters the radiator. But do not rejoice: when the temperature reaches 90 degrees and above, the upper and lower pipes should be hot. Only in this case can we say that the thermostat is fully functional. Please note that the stove works in all modes, regardless of whether antifreeze circulates in a large or small circle insystem.

When the engine overheats, then in the piston group there is an increase in wear of all rubbing parts. In this case, all bearings fail instantly, it is possible that the pistons will begin to burn out. Of course, frictional losses occur. The whole process of ignition of the fuel-air mixture, which occurs in the combustion chambers, is disrupted. Along with this, a decrease in power is observed. It also increases fuel consumption. Please note that excessive heat may cause the pistons to cycle in the cylinders.

Overheating

Often overheating occurs as a result of clogged radiator. A lot of debris and scale accumulate in its cells, this prevents not only the movement of antifreeze through the channels, but also reduces heat transfer. As mentioned earlier, on domestic cars, the thermostat is stuck in a position where the liquid circulates only in a smaller circle. However, it does not enter the main radiator. Consequently, the liquid does not have time to give off heat, but it constantly warms up in the cooling jacket.

To get rid of this malfunction, the most acceptable way is to open the stove tap completely and turn on the blower fan at full power. Of course, this will give an effect, but not so significant. It is advisable to install a new thermostat so that the fluid circulates normally. If you do not monitor the level of antifreeze in the system, this leaves its mark. The result of this is, of course, an increasetemperature.

Electric fan and pump

Please note that the malfunctions of the YaMZ-238 engine cooling system are the same as for VAZ cars. But it may also be that the circulation occurs in both circles, the thermostat is working, but the engine still overheats. Often this happens in those systems in which the installation of an electric fan is provided. As a rule, the sensor fails, with the help of which power is supplied to the electric motor. Overheating is also possible if the belt that drives the water pump is broken. Or if it is incorrectly adjusted.

Engine hypothermia: common causes

And now about when hypothermia can occur in the engine. For normal conditions, that is, even when the temperature reaches minus 20 degrees, the engine should warm up relatively quickly. Even if it is not additionally insulated. This is the design of the motor, it can function normally in a wide temperature range. Of course, if it is very cold in your region in winter, it is advisable to use fireproof heaters. But if the thermostat is in the open state, when circulation occurs only in a large circle, hypothermia simply cannot be avoided.

Less common causes

It is also possible that some vehicles that have a forced-driven fan will experience hypothermia. Therefore, many drivers are replacing a mechanical fan with an electric one. It is worth noting that the latter practically does not turn on in winter if the temperature outside is below zero degrees. Just pay attention to the fact that the entire system must be perfectly sealed. It should not have any cracks. All seals and gaskets must be intact, without damage. Under no circumstances should the radiator be leaking. There are such malfunctions of the VAZ-2110 engine cooling system, they are similar for all cars.