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Schematic
Here's a schematic of the Compressor Clutch Control Wiring Circuit:
From what I can make of it, there is either a shorted wire (pinched) or something wrong with the temperature controller. I would suspect a pinched wire, as the input to the temperature controller is for a feedback circuit. Another possibility is something awry at the compressor relay. Probably the easiest way to check it, is to remove fuse #11, disconnect the compressor clutch and see what your resistance values to ground are. BTW, the temperature controller is above the passenger's footwell.
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Sam
84 300SD 350K+ miles ( Blue Belle )
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