See also:

Engine coolant
The high-pressure cooling system has a reservoir filled with year round antifreeze coolant. The reservoir is filled at the factory. Check the antifreeze protection and coolant level at least once ...

Kia Magentis Owners Manual
...

Engine START/STOP button
Illuminated engine start/stop button Whenever the front door is opened, the engine start/stop button will illuminate for your convenience. The light will go off immediately when the engine start ...