For topping up even in the warm season, you need to use a mixture of antifreeze with distilled water.
Attention: In extreme cases, to continue the trip, especially in the warm season, you can add clean water to the system. As soon as possible, the density of the coolant should be checked and corrected.
Location option - radiator
Location option - partition
Coolant level on a cold engine (coolant temperature approx. +20°C) should be at the mark on the expansion tank or slightly higher.
Add cold coolant only to a cold engine to prevent engine damage.
Attention: Do not open the expansion tank cap on a hot engine - this is dangerous, as the cooling system is under pressure. The cover may only be opened when the coolant temperature is below 60°C. Cover the lid with a cloth when opening.
When opening the cap of the expansion tank, first turn it slightly and release the pressure. Then carefully twist the cover further and remove it.