You can get various products at NAPA or other such places that are simply called cooling system flush, fast flush, etc. Just follow the directions, then make sure you do a very good job of flushing that stuff out when you're done. Most I think are a phosphoric acid so be carefull with them... I find those products take out a lot of crap and gunk. I don't have a big problem with scale tho... I never had much luck with vinegar for what I need to clean out either.
Just remember to pull the block drain (and don't open the drains, REMOVE THEM), the rad drain and the lower rad hose and make sure you spend a lot of time backflushing both the block and rad until you get all the crap out. Once that's done it should help it run a lot cooler.
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Today's Featured Article - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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