Did you replace your thermostat? It’s a bit vague when you say you start the car up and in a few minutes coolant starts boiling over so I had to ask.
A stuck thermostat will make the coolant boil over and depending on your sensor location you may not show the car heating up at all while it can’t circulate.
Just another possibility…
If the car is stone cold and this is happening after say 1-2 minutes, rather than 5+ then ignore this, but when it’s this hot out coolant does warm up rather quickly.