Try the Calci- Solve or whatever the other guy recommended, if that doesn't work try the CLR, if that doesn't work go to a farm supply and get some of the Acid dairy farmers use on their milk equipment to control milkstone deposits (it's a phosphoric acid), if that doesn't work look for 66 baume Hydrochloric Acid (may also be called Muratic acid) if you work at it long enough the Muratic will dissolve the mineral build up OR the heater core itself. By the time you get to the Muratic/Hydrochloric acid your are employing the Nuclear option on mineral build ups. But before I did all of this I'd make sure the valve that controls flow through the heater core is working and isn't plugged itself.
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Today's Featured Article - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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