Thermostats cool engine coolants by holding them in the radiator until needed. That's what they do. Not having a thermostat can cause an engine not to get up to proper operating temperature for an extended period of time, AND can cause an engine to overheat because once it does heat up, then the coolant isn't held in the radiator to properly cool. Installing a thermostat is a good idea. As far as installing a shroud, I don't know that that tractor had one originally, but that doesn't make installing one a bad idea. Fan shrouds are installed in motor vehicles for a reason, to properly force a funnel of air through a radiator to properly cool the coolant in the radiator as opposed to having the fan do what it does, draw air from anywhere it can get it, even from the sides and not through the radiator if there's no shroud to funnel the air. Use quality mixed antifreeze as well, not straight water that has a lower boiling point and will cause corrosion much faster.
That being said, if your tractor is overheating, you may have something else going on. However, installing a thermostat is one of the best place to start in prevention along with making sure that the radiator is clean inside without clogged passages. Installing a shroud that encompasses the radiator down to an exit not much larger than the fan blades themselves will NEVER hurt and will also better direct/aim cooling air back at the engine as well. There have been a vast amount of improvements since that tractor was manufactured, incorporate them whenever possible.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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