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Originally Posted by digdug1
This evening I started the tractor and let it run for several minutes. I got it up to operating temp on guage. I pulled off the radiator cap and I could not see any coolant movement. I reved up the engine and still no movement. Top radiator hose was warm and coolant at the cap was warm (not hot). Bottom radiator was not warm. This would indicate that the thermostat is not opening fully as JC mentioned above. Does that sound right?
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I'm not sure how much "movement" you will see just when it gets to operating range. Could be with no load on the engine that the thermostat only cracks open and so flow is really minimal - not much more than a trickle.
The 1720 gage (at least my old one) was divided into 3 ranges. I think my 1720 even when under load usually was down around the dividing line between the lower and middle range. Never did it get to the top of the middle range or approach the red unless the screen was really dirty. As the gage seems to moving normally, I'm thinking that maybe the thermostat is not fully opening or there is some pluggage somewhere. I think I might start with replacing the thermostat, or doing a flush, but not both at the same time as you'll never know what the problem really turned out to be. I thihk the coolant is supposed to be replaced every year or two. Do you know if that was done?