Draw some coolant from the expansion tank into the hydrometer.
The hydrometer is immersed to different depths depending on the specific gravity of the liquid.
On the scale you can see up to what temperature the frost protection is enough.
Some of the frost resistance testers are equipped with an arrow that indicates the degree of frost resistance.
Control of antifreeze concentration
In most cases, it turns out that the concentration of the coolant is already insufficient. You need to add a little antifreeze; about ¼ liter for every 10°C below normal.
Remove the bottom protection of the engine compartment (chapter «Body elements»).
Place a container under the car.
Open the drain plug on the bottom of the radiator, or remove the bottom tube on the radiator.
Be careful and careful if the coolant temperature is high!
Drain 1-2 liters of coolant.
Reinstall the tube or tighten the plug without pressing.
Add an appropriate amount of undiluted antifreeze and top up the collected coolant from the container.
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