The boiling point of antifreeze ranges from 110 to 125 c depending on the concentration. For Japanese specs, the operating temperature is around around 93 - 95 c.
If you do not have any coolant in the system, it is going to run with a higher pressure and is not advisable.
Has coolant been added to your system?
We used to get overheating problem with European makes when they were imported used as the specs do not match. One of the things we did to overcome this was to replace the radiator with a higher capacity with better cooling efficiency. The thermostat is also replaced with one that opens at 82 c.
Maybe you can consider this option.
Saturday, October 28th, 2017 AT 1:47 AM