F 250 4WD Pickup V8-7.3L DSL Turbo VIN K (1994)
Fan Clutch: Testing and Inspection
Fan Clutch Noise
Fan clutch noise can sometimes be noticed when the clutch is engaged for maximum cooling. Clutch noise is also noticeable within the first few
minutes after starting the engine while the clutch is redistributing the silicone fluid to its normal, disengaged operating condition after settling for
long periods of time (over night). However, continuous fan noise or an excessive roar indicates the clutch assembly is locked-up due to internal
failure. This condition can be checked by attempting to manually rotate the fan. If the fan cannot be rotated manually or there is a rough, abrasive
feel as it is rotated, the clutch should be replaced.