Engine Coolant Indicator
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.
The IPC illuminates the LOW COOLANT indicator (diesel only) when the Coolant Level Indicator Module (CLIM) detects a low coolant level condition (signal low).