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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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