Many compatriots become unnecessarily worried and tear the hair on their heads every time the level of antifreeze in the expansion tank is reduced. At the same time, the majority of fellow citizens do not know that in reality you need to worry strictly the opposite case - when the level of antifreeze in the tank begins to grow by itself for some unknown reason. If this is the case, there is a problem with the car.
1. Airlock
The first and one of the most common reasons for an increase in the level of antifreeze or antifreeze (antifreeze itself is just a domestic brand of antifreeze, still Soviet) in the tank. An airlock in the cooling system can also cause the car's thermostat or ventilation system to stop working.
2. Damaged gasket
Less common, but much more serious damage is damage to the cylinder head gasket. When this happens, exhaust gases begin to enter the cooling system. They, in turn, squeeze out the non-freezing composition, which is fraught with a bouquet of various breakdowns. It is easy to identify a damaged gasket - just unscrew the oil filler cap and check for a white coating. If there is, it's time to go to a car service for help.
3. Damage to the pump
An equally popular breakdown is damage to the water pump. A faulty pump can also cause the antifreeze to be squeezed back into the tank. It is also very easy to troubleshoot this kind of problem. It is enough to inspect this very pump and check if there are any leaks around it. If such a malfunction is not eliminated in a timely manner, then first you will have to face a break in the timing belt, and then completely overhaul the car.
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4. Depressurization
Not a very common cause of rising coolant levels, but still worth mentioning. Depressurization of the cooling system most often occurs next to the heater. If it happens, then a characteristic burnt smell will begin to be felt in the cabin. Troubleshooting is inexpensive if you take appropriate action on time. However, it should be remembered that until the repair is completed, the likelihood of engine overheating in the car will significantly increase.
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5. Engine overheating
Actually, the engine overheating itself can cause an increase in the level of antifreeze in the tank. Most often this happens when the fan in the engine breaks down or the temperature sensor fails. Fortunately, overheating the powertrain will be extremely difficult to ignore.
Continuing the topic, read about how drivers are fooled at service stationsand how to avoid it.
A source: https://novate.ru/blogs/190420/54203/