SGCM Cooling System Operation
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 purpose of the starter/generator control module (SGCM) coolant system is to cool the SGCM internal electronics. The SGCM commands the SGCM the SGCM coolant pump and coolant fan ON or OFF at the following temperatures:
- Coolant pump from OFF to ON at 60° C (140° F)
- Coolant pump from ON to OFF at 55° C (131° F)
- Coolant fan from OFF to low speed at 75° C (167° F)
- Coolant fan from low speed to high speed at 80° C (176° F)
- Coolant fan from high speed to low speed at 75° C (167° F)
- Coolant fan from low speed to OFF at 70° C (158° F)