overheating while standing still means a bad fan clutch, the problem is airflow
when is overheating and spilling coolant everywhere, touch the radiator, if it´s relatively cold to touch, aka you can hold your hand against it, it MAY mean the radiator is clogged OR the thermostat is stuck closed, or there may be lots of rust inside the engine block, the problem is coolant circulation
also the stock pressure bottle zucks, it likes to crack and not hold pressure, not holding pressure means overheating, a cap that doens´t seal properly also leaks pressure and causes overheating
why everybody go straight to the thermostat? a stuck thermostat causes overheating but come one, it can be it every time...