What causes the pulley on the front of the air compressor to stop turning?

2000 FORD F-150
83,000 MILES
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I was driving, with the a/c on, when the engine starting "bucking". I drove less than one mile afterwards. The pulley on the front of the compressor was not turning, no other lights or symptoms. This model F-150 cannot bypass that pulley, I am told.
Jul 10, 2012 at 5:34 PM
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DOCFIXIT
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Two part pully is part belt rides on turning?
Jul 10, 2012 at 5:37 PM
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The part that the belt rides on does not turn.
Jul 17, 2012 at 1:17 PM
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