Overheating issues

George Jets said
Fascinating . . .
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George Jets said
Interesting, probably why the 16 psi radiator caps are used.

This allows the cooling system to build pressure to 16 psi to overcome the (push back) atmospheric pressure of 14.7 psi in the vented reservoir tank.

When the coolant is expanding, then it is allowed to flow into the reservoir from the pressure difference between the 2.

☆☆☆☆☆
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You are confusing reference pressures.
14.7 psi is the approximate Absolute Pressure of the atmosphere at sea level.
16 psi pressure on the cap is the pressure difference between the inside and outside of the cap.