Fan Noise

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

Fan noise is sometimes evident under the following conditions:

When the clutch is engaged for maximum cooling.
During the first 15 seconds to 1 minute after start-up until the clutch can redistribute the silicone fluid back to the fluid's normal disengaged operating condition (after overnight settling).

Fan noise, or an excessive roar, generally occurs continuously under all high engine speed conditions (2500 RPM and up) if the clutch assembly locks up because of an internal failure. If you cannot rotate the fan by hand, or if there is a rough grating feel as the fan is turned, replace the clutch. Refer to Fan Clutch Replacement .