I had the same problem on myf250, it defaults to defrost, it's a problem with the pump I think it was, does your 4wd drive work by the knob, with the vacume? I just plugged the 4wd side and my AC worked again. I have manual lock hubs so I dont need the vacume, if I remember the pump builds pressure and stores it in the reserve tank. You may also have a vacume leak somewhere.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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