Sirion green water temp light

Forum: 

Hi my friend bought a 2009 2nd hand sirion just last week and has noticed a green water temp light comes on when she starts the car, stays on about five minutes then goes off. Is This normal? I read the entry in the manual as it comes on when the water is cold and goes off when it’s hot? It just seems confusing

See picS

Thanks
https://ibb.co/RcJz6mQ
https://ibb.co/TrvMFqp