Is it normal for car coolant to have some loss under normal circumstances?

[LaPreston]

It is normal for coolant to have a slight loss. Although the entire cooling system is sealed, the coolant reservoir cap has a pressure relief hole. When the internal pressure reaches a certain value, the coolant will leak out from the pressure relief port. Methods to determine if coolant is low: Observe the coolant warning light on the dashboard. If it lights up, it is likely due to low coolant, although it could also be caused by excessively high cylinder temperature. Check the coolant reservoir. If the fluid level is below the minimum mark (MIN), do not continue driving and add coolant promptly. Check the water level markings on the coolant reservoir. The normal coolant level should be between the maximum and minimum marks. Whether the coolant is low depends on these marks; if it is below the minimum mark, it indicates a shortage of coolant. Methods for selecting coolant: The basic indicators for coolant are freezing point and boiling point. On the market, coolants come in specifications with freezing points of -15°C, -25°C, -30°C, -40°C, etc. Generally, it is advisable to choose a coolant with a freezing point at least 10°C lower than the lowest temperature in your region.