Coolant temperature

You can run your car at 230 degrees without hurting anything, as long as it stops there at 230. If it starts climbing more you need to change antifreeze or add some more. Its possible that the Waterpump or Headgasket is going bad. When its very hot outside the temp gauge goes up a little bit. Your main concern should be to keep your engine below the RED part of the gauge meter

My 2018 dodger charger Temps fluctuate. As im driving it climbs over the half mark. As I keep driving it drops to the exact half way mark. It contains to climb up then down. Is that normal?