The identical problem occurred with two different compressors--1st one that came with the car was rebuilt and the one I installed is brand new. Also, the clutch works perfectly when 12v+ is applied to the lead-in wire going to the clutch coil. The air gap on the new compressor on the '98 is less than 0.020".
Also, the thing that's so strange with this situation is that the clutch plate doesn't even move while all the racket and vibration is occurring. Next thing I plan to do is to see if I can detect any magnetism when the noise happens. And some follow-up info: Today I noticed when I inserted the AC clutch relay, the clutch engages, but only for a half-second or so. And when I connect a test light to the clutch (lead-in wire) it also lights up for an instant when I insert the AC clutch relay into its socket. Don't know if that provides any clues as to what's happening....??
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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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