Fan Clutch Diagnosis: Noise
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Fan noise is sometimes evident when the following normal conditions exist:
- The clutch is engaged for maximum cooling.
- The engine has been running for 15-60 seconds after start-up.
After this time, the clutch can redistribute the silicone fluid back to the normal disengaged operating conditions.
Fan noise or an excessive roar may occur when the following conditions exist:
- The engine speed is 2,500 RPM or higher.
- The clutch assembly is locked up due to an internal failure.
Rotate the fan (1).
With the engine off, replace the clutch (2) if the following conditions exist:
- The fan cannot be rotated by hand.
- The fan produces a rough, grating feel as it turns. Refer to Fan Clutch Replacement .