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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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