G 20 Van V6-262 4.3L VIN Z (1993)
Fan Clutch: Symptom Related Diagnostic Procedures
Clutch Fluid Leak
Small fluid leaks do not generally affect the operation of the unit. These leaks generally occur around the area of the bearing assembly, but if the leaks
appear to be excessive, engine overheating may occur. Clutch and fan free-wheeling can cause overheating. To check for clutch and fan free-wheeling,
turn the motor "OFF." Spin the fan and clutch assembly by hand. If the fan spins five or more times before it stops, replace the clutch.
Fan Clutch Noise
Fan clutch noise can sometimes be noticed when clutch is engaged for maximum cooling. Clutch noise is also noticeable within the first few minutes
after starting engine while clutch is redistributing the silicone fluid back to its normal, disengaged operating condition after settling for long periods of
time (overnight). 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 fan. If fan cannot be rotated manually or there is a rough, abrasive feel as fan is rotated, the clutch
should be replaced.
Fan Looseness
Lateral movement can be observed at the fan blade tip under various temperature conditions because of the type bearing used. This movement should
not exceed 1/4 inch (6.5 mm) as measured at the fan tip. If this lateral movement does not exceed specifications, there is no cause for replacement.
