SGCM Coolant Fan
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The SGCM coolant fan is controlled through a solid state relay by the SGCM. The SGCM coolant fan is a puller type fan that draws air through the SGCM radiator.