If ypu decode to change the thermostat. get o cooler one... they have 2 kind of thermostat, Normal and Lower Temp ...

 

Thanks Lugnut (~.~). I just look stupid. Guess what? I drove this car and never notice the sign C by the coolant needle. At 100C; it is just 212F which is the boiling point. You right, I should not be worried. Temperature of around 100C or 212F is just normal for better and smooth running of any vehicle. Most American cars only have H and red column.
Enjoy your weekend holiday.

 

The boiling point is higher than 212F. The coolant system is pressurized.