Years ago you had a supply line and return line from the heater coil inside the cab. The heater control was mechanical....cable from inside cab to butterfly flow valve in one of the lines....supply I guess under the hood.
If that valve stuck closed, like would happen in the summer with no use, you would have the problem mentioned. Problems I had I noticed that the cable would move, the cam on top of the valve would move, but the connection between the cam and the shaft that led to the butterfly that controlled the flow had broken. Butterfly was frozen closed and hence no hot water flowing through the heater radiator in the cab. New inline valve solved the problem.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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