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In Reply to: Farmall A cooling system posted by Ron on Thursday, June 04, 2009:
Ron: Your tractor has what the industry calls thermosyphon cooling. The boiling you heard after shutting it down is quite nornal, and can be reduced somewhat by letting tractor idle and cool down about 3 min. before shutting it off.
You may not have any leaks, full with one of these systems is about 2.5" from the radiator neck. If you try to keep more than that amount in the radiator it runs out with expansion. These are not a pressurized cooling system.
In short if your system maintains a level 3" from radiator cap, bubbles and gurgles if you shut it off hot, it is working perfect. I have one of these, close to 60 years old and still on it's original radiator. That is why the radiators are expensive. Given the years of service, a fraction of the cost of a modern day auto radiator.
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