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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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