I can guarantee you that if you block the flow completely to the radiator that engine will warm up in below zero weather. The bypass will not keep the engine cool, it only allows circulation through the engine until it warms up enough to open the thermostat. It will get warm. The reason they do not is because flow is going past the thermostat and into the top of the radiator period. IH fought those dog gone lame thermostats all their life. We used to put thermostats in the hoses on some vehicles to allow warm up because too much flow was going past the stat.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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