*F = *C x 1.8 + 32

Water freezes at 32* and boils (at sea level) at 212* Farenhite.
Water freezes at 0* and boils at 100* Centegrade.

So 115*C is about 230*F, as long as your cooling system is pressurized so it doesn't boil out you should be fine, that's not enough heat to dammage oil or mechanical componants.

100*C is 212*F or atmuspheric boiling point at sea level.
90*C is 186*F which is what your average automotive thurmostat is set for.

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