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What make/model? Some seem to be more prone to thermostat problems than others. Generically speaking, I've found it to be the case that if you're working a tractor hard on a hot (80+) day, it will run hot to some degree. When running a grain vac, I prefer to tie a garden hose to the radiator, and let cold water run across the radiator fins while I'm running it. Makes the coolant temperature fall by almost a third (one full mark on the temperature gauge, IH 1086.) As for mechanical problems... Have you flushed it lately? Or completely drained it and put in fresh antifreeze? It does get old after awhile, you know. Over in the Oliver forum awhile back, somebody mentioned some way of de-lime-ing the coolant system. Something like drain it, fill it with vegetable oil, run it until it gets hot, and let it sit overnight or a couple days, the longer the better. I'm thinking "old" or the "nebraska cowman" might know the proper method. How do you know it's not the thermostat? I like to test those with a pan of water on the stove, with a candy thermometer in the pan. Remove the thermostat, put it in the pan, and heat it to see when/if it opens.
But honestly, I'm waxing poetic. If it's 100 degrees and your working a tractor, I don't think you have a problem. Blame the weather.
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