As 'ericlb' has said, you need to verify that the engine is actually overheating it's possible that you have a hyper-active temperature sender or dash gauge.
Since this vehicle is computer controlled, and if you can get your hands on a data scanner, it's really quite simple to diagnosis a possible dash gauge malfunction by comparing the 'ECM' coolant temp sensor value with the dash gauge value...
If a Scanner isn't available, another method would be to use a laser pyrometer aimed on the thermostat housing during the early run time temp fluctuation.
Also, look for a steady stream of air bubbles in the radiator (head gasket) & check to see if the coolant flows with force & doesn't dribble, I've seen some slipping & rotted water pump impellers that have caused similar problems.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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