Hyundai Repair: over heating, air pockets, cylinder head

Question
im working on a 05 2.7 sonata. its over heating at idel its ok but when i rev it up the data shows over heating 225F but at idel  temps from 195-208 then fan kicks in. water pump is ok and thermostat has been replaced.

Answer
Start by rechecking the coolant and making sure there are no air pockets in the system.  

If the fan isn't turning on despite a temperature of 225, you should check the fan circuits.

If neither of these problems are present, you may have a problem with a cylinder head or gasket.