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Why do drivers keep the level of antifreeze in the tank to a minimum?

  • June 29, 2023
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Much has been written about the importance of proper cooling system operation for the “health” of the machine. However, the controversy is still not abating. For example, some

Why do drivers keep the level of antifreeze in the tank to a minimum?
Much has been written about the importance of proper cooling system operation for the “health” of the machine. However, the controversy is still not abating. For example, some “steersmen” make sure that the level of the “coolant” is strictly at the MIN mark, and not at the maximum. The AvtoVzglyad portal tells why they are doing this.

To begin with, we remember that until the engine has reached operating temperature, the antifreeze is driven by the water pump in a small circle. And once the engine warms up to 90 degrees, the thermostat opens, creating a large circle of circulation. As the liquid is heated, the volume of the liquid increases by about 3-5%.

If there is too much of it, the pressure in the system will increase, which can lead to leakage from hoses, pipes, and also from under the cap of the expansion tank. That is, this cover cannot withstand loads. If this happened on the way, it makes sense to stop, let the engine cool down and pump the antifreeze to the MIN level. That way the lid won’t pop off. When you get to a city with a car dealership, buy a new part and forget about the problem.

The minimum fluid level is also maintained for diagnostics. During its replacement, for example, a concentrate was poured into the system. And it must be diluted with distilled water in a ratio of 50 to 50. But the masters missed and poured more water. It starts to boil away, the level drops and the amount of steam increases. After that something like described above happens. When the engine stops, the coolant boils sharply and the steam squeezes it out. The minimum level excludes such sharp declines. Then you need to let the engine cool down and add the rest of the concentrate.

Mysterious things have also happened to cars like the Tavria or the 1998 Audi A4. When the coolant level is at the MAX mark, it expands in volume when heated and the excess flows out through the drain at the back of the tank. This continues until the level drops to MIN. Then the “games” stop. Many car forums write that this is a completely normal phenomenon and you should not think that there is a malfunction somewhere. Therefore, sometimes you don’t have to worry.

Photo: Drive2.ru (hybrids)

To begin with, we remember that until the engine has reached operating temperature, the antifreeze is driven by the water pump in a small circle. And once the engine warms up to 90 degrees, the thermostat opens, creating a large circle of circulation. As the liquid is heated, the volume of the liquid increases by about 3-5%.

If there is too much of it, the pressure in the system will increase, which can lead to leakage from hoses, pipes, and also from under the cap of the expansion tank. That is, this cover cannot withstand loads. If this happened on the way, it makes sense to stop, let the engine cool down and pump the antifreeze to the MIN level. That way the lid won’t pop off. When you get to a city with a car dealership, buy a new part and forget about the problem.

The minimum fluid level is also maintained for diagnostics. During its replacement, for example, a concentrate was poured into the system. And it must be diluted with distilled water in a ratio of 50 to 50. But the masters missed and poured more water. It starts to boil away, the level drops and the amount of steam increases. After that something like described above happens. When the engine stops, the coolant boils sharply and the steam squeezes it out. The minimum level excludes such sharp declines. Then you need to let the engine cool down and add the rest of the concentrate.

Mysterious things have also happened to cars like the Tavria or the 1998 Audi A4. When the coolant level is at the MAX mark, it expands in volume when heated and the excess flows out through the drain at the back of the tank. This continues until the level drops to MIN. Then the “games” stop. Many car forums write that this is a completely normal phenomenon and you should not think that there is a malfunction somewhere. Therefore, sometimes you don’t have to worry.

Source: Avto Vzglyad

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