Overheating after replacing radiator & thermostat in my 94 318I

try this first after you install everything back in place remove the top radiator hose fill with coolant from this hose unscrew the bleeder located on the radiator when the coolant is topped off restore the hose to the radiator crank your vehicle and watch the gauges miracle from haven questions or follow ups call 704-777-5274 nick thank you

You could have a faulty temperature sensor or week water pump, and the antifreeze may not be the right 50/50 mix. To much antifreeze mix will still over heat, 100% antifreeze will gel up when heated restricting the fluid flow. Check the antifreeze mix and keep it to 50/50 mix (antifreeze/water), also check if you have an electric radiator fan that it's  working. Good luck and keep me posted. 

check sensor
check actual temp with non-contact thermometer