One more thing you might check. I have fixed many mid 80"s chevy cars with these same symptoms by eliminating a connector located in the engine compartment that runs from the controls to the blower motor. The connector is undersized and will eventually melt open. When this happens you"ll lose the fan speeds, starting with the high speed. Not sure if the trucks have the same connectors or not. The connector is only in there for ease of assembly at GM, and not needed after that, so I typically just solder the wires together and elimnate the connector.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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