Wheels,
Don't worry about 200F. That's fine. If you're running 25-50%
antifreeze and a 15psi radiator cap, it shouldn't boil unless you're over 220F. You needn't worry unless it boils. I have a 180F thermostat and it runs dead on at 180 if I'm moving but it'll climb to 200-210 at idle on a 100F day.
Chris