Overheat and fan does not stop for while and sometimes my laptop freez

Try replacing the thermal paste. Apple's thermal paste is not very good at effectively cooling their computers, even the newer models. I had a similar issue with my mid-2009 MacBook Pro, where just opening a website would shoot the temperature up to 180°! I replaced it with some thermal take thermal paste and the temperatures would max out at 140°. You could also try installing Macs Fan control which allows you to control when your fan will start to spin faster or just to spin fast all the time. I would recommend setting your custom setting to CPU proximity and the min to 100° and the max being 132°.