Why does my AC compressor not turn off?

A/C compressor clutch .

The compressor clutch will not disengage when the A/C control is switched to off.

A/C clutch coil shorted.

If the positive wire to the compressor clutch coil is shorted to a 12-volt source, the compressor clutch will not disengage. This is simply because there is no control of the power to the clutch. 

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