I ask this same question years ago after getting my 48 JD M running. The best advice I rec'd was run 'er and if she isn't boiling don't worry about it. I thought this a rather callous approach but ultimately went with it. And, the tractor is still going after 17 years. As posted previously, the M has a thermo-siphon cooling system absent of a water pump. A good thing cuz less parts to wear out but I think John Deere was pushing technology a bit with the thermo-siphon system. You will notice that it will run on the warm side when hot outside but well within range when cold outside. That said, it should never boil. If it does boil, you are working the tractor way too hard. Hope this helps and enjoy the sweet music the M makes. With some common sense, the tractor will last you a long time.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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