I had the same problem in my 1995 850 at 110k miles. The fix was to remove the shims. The car is now 176k miles old and the fix has lasted so far.
AC is on 100% of the time the car is used.
I took the car to an AC shop, and work was done from under the car. It took a little bit over one hour. The splash guard was removed, the right front wheel was removed and a couple of screws holding the compressor to the subframe were removed. The compressor drops down enough to reach the screw on the center of the clutch assembly. The hoses to the compressor were not removed, so there was no need to recharge the system. There were three shims. Two very thin and a thicker one. Just the two thinner ones were removed.
Hope this helps.
Icelandic
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