Coolant temp digital readout above temp gauge reads 230 when pulling hill at 75

Hello, i'm not certain that 230 degrees is too hot. The workshop manual says that the engine thermostat only reaches completely open position at 217.6 degrees. If you momentarily exceed 218 degrees for a short period of time -- I personally wouldn't be too concerned. If it gets higher than that, or does not seem to cool properly, i'd continue to press the issue for further diagnostics. That engine has a "fail safe" mode to prevent damage from overheating which will shut down cylinders and engine performance to protect the engine.