Complex answer to come:The thermostat temperature is a modest variable across maybe 10 to 15 degrees. If a tractor load is constant and near the working ideal wide open throttle and loaded to PTO rpm) and the outside temperature is pretty constant, the pressure cap should never come into play. The actual pressure will vary, but never reach the relief pressure. If the engine rpm is increased (while within thermostat control) the engine will create more heat from increased fuel consumption. This heat will open the thermostat more. if loaded such that the thermostat is wide open, any further load, or increase in ambient temperature will increase the coolant temperature until the radiator cap pressure is exceeded. There will be steam and coolant expelled. I hope this makes sense. Jim
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