First, are you sure it overheated? If the radiator is overfilled it will push out water from the cap. The 'N' only needs to have the top of the tubes covered when you look into the radiator. If it was not overfilled then watch for flow in the radiator, no flow check the thermostat located in the top radiator hose for function and proper installation.
It could have overheated but the cooling systems are WAY overbuilt on the 'N' and I will bet on the radiator being over filled.
It could have overheated but the cooling systems are WAY overbuilt on the 'N' and I will bet on the radiator being over filled.