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 - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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