The coolant/antifreeze doesn't loose it's ability to prevent freezing or transfer heat as long as it hasn't been diluted with too much water.
It does loose the rust/corrosion inhibitors and can allow the radiator to clog internally with rust and calcium deposits.
If the coolant is rusty red, the radiator may be partially clogged. Might try flushing the system and refilling with 50% antifreeze and distilled water. I would not use any type of flush, just open the drain valve on the radiator and block, and flood with the water hose while the engine is idled up.
Be sure the radiator isn't clogged externally with grass or sand.
As far as brands or types of antifreeze go, I wouldn't think a tractor would be too particular about that unless it's a new high tech model, something with an aluminum radiator. Change it about every 2 to 5 years.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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