I used a molasses solution for alot of my rusted parts, including a seized heater motor. After the bath for 2 weeks and tear down I cleaned it with a hot water spray in the Laundry room tub ( don't mention this to my wife) and reassembly the heater works great.
http://s1281.photobucket.com/user/d...20remover%20experiment?sort=2&page=1


1950 Chevrolet model 1434 5-Window Canadian manufactured 1-Ton with Dump Bed / Hoist
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You will never stop learning new things, no matter how old you are.