Fan Clutch Diagnosis: Noise

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Sometimes fan noise is present under the following conditions:

The clutch is engaged for maximum cooling.
The noise is present the first 15 seconds to 1 minute after start-up. This condition occurs until the clutch can redistribute the silicone fluid to the normal disengaged operating condition (after settling 2-4 hours).

Fan noise or an excessive roar generally occurs under all high-speed conditions (2500 RPM or higher) if the clutch assembly is locked up due to internal failure. If the fan cannot be rotated by hand or there is a rough grating feel as you turn the fan, replace the clutch. Refer to Fan Replacement .