I would not consider the RPM to be a factor. The issue is happening while still putzing around at High Idle and less. Leave the cap loose (if it is a pressure cap)and get it warmed up to the point that the gauge is in the middle of the range. Remove the cap (carefully) and look for flow. Use a candy thermometer to check the temp of the coolant in the tank. If it is flowing well, the issue might be deposits in the tubes. If not flowing it is either plugged tubes, or a mechanics rag left in the water jacket (I've done it in my youth) Jim
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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