2002 Vauxhall Astra Motar rotates fan belt of rediator maki

Engine Performance problem
2002 Vauxhall Astra Four Wheel Drive Manual 88000 miles

Hi,
Actually the motar which is connected to the fan belt
is making some noise,what might cud have happened?
And also the coolent in my car is finishing in 2 to 3 months and there is no sign of any leakage when check
in the morning everyday before starting the Engine.Please advice.Thanks