overheating

I fixed up the bike last spring fresh oil let a mechanic rebuild the carb new tires. And all of last summer it would overheat if I rode it any where..i didn't do to much riding last year so it wasn't a concern at the time. But I took it out of storage this year rode it 2 minutes down to a gas...

In a matter of 15 minutes of riding my bikes temp raised to 250 and started smoking and I believe coolant fluid was boiling out through the bottom but I'm not sure what's wrong with it. My fan will not come on at all. The fuse for it is still good. And it is continuing to not turn on so I drove...