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 - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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