Kevin from another board answered it for me! Evidently, a fault is
detected if the clutch does not cycle within so many times in so much
time period. When this happens, the AC faults. He told me to
disconnect the battery to resolve the fault. So I disconnected the
batery, jumped the low pressure switch, then reconnected the battery.
Started the truck, and the AC compressor was working!!! I immediately
put in the freon charge, and removed the jumper & reconnected the
switch. Now enjoying cold air.
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