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 Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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