Lee, the fan clutch on my '91 has always had the following characteristics:
- Engine cold before cranking - resistance in clutch, when you spin it by hand it will stop within 1/8 of a turn.
- Engine fully warm, between 80-95 degrees. Very easy to turn, will spin at least one revolution if you spin it by hand. You think it's bad it's so loose.
- Engine hot, 100 or above. Tightens up again, similar to when cold.

The fan is very quiet at normal operating range, but when the engine gets up near 100 degrees C, you can hear the fan howl as you accelerate. the electric fans come on about 110 and off again at 100.

DG