Put blower on high and select full hot, then feel the hoses after 5-10 minutes. If one is hot and other cold, the heater core is prob restricted. accessing or replacing the heater core is not a big deal on these trucks.
The temp control is cable operated, so move the temp knob quickly both ways and you should hear a nice "thump" noise at full cold and full hot. If you don't hear a thump, then something is blocking the door. Door obstructions were common in these years, anything you set up on the dash that can fall through the def vents, will eventually make it down to the temp blend door and keep it from shutting hot/cold.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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