I have a overheating issue.

What is your question?

the thermostat and two fan motors have been replaced. The radiator is two years old. The temp. still reads above center. It will almost go into the red then settle to just above center fluctuating between the two points. The radiator has been flushed and new coolant added. I had the intake manifold gasket replaced which solved the acceleration issue. Goodyear cannot find what is causing the overheating and said as long as its not in the red not to worry. I have seen some coolant leakage but they can't find that either.