High Coolant Temperature

Location/place: Mysore

Name of company/service: Infosys

Hi I am Gautham, I bought Pulsar 200 NS in the month of Feb 2013. Suddenly I am facing a strange problem in my bike, when ever I am starting my bike and riding it for some 1 or 2 kms the high coolant temperature symbol gets on and the radiator fan is getting on. This is happening when I start back from office again. Kindly let know what could be the issue

Regards
Gautham