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Could there be an air bubble trapped somewhere? You can jack up the front of the car and let it run for a few minutes without the radiator cap topping up as you need to to try and release any trapped air.
Could also be a blockage somewhere causing pressure to build up. You could remove hosed and check them it could be internal or in the radiator also if that's what it is.
Could also be a blown coolant seal overpressurising the system. My vert did that before I rebuilt it air to a coolant seal. Does it smoke white on startup? You can remove the fuses for the computer in the engine bay and open the too most radiator cap and too it off and drank the engine and if you get large bubbles and possibly a geyser of coolant than it's likely a coolant seal. If it is the engine will need a rebuild. It's possible for the car to run fine like that with the only symptom being loss of coolant.
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