Coolant Level Control
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The engine cooling system contains an engine coolant level switch to alert the driver in the event of a coolant loss. The coolant level switch sends out a coolant loss signal over the low coolant level indicator control circuit through the underhood accessory wiring junction block. When the coolant level switch reads a low coolant level in the cooling system the switch closes. The instrument cluster has a coolant level warning indicator that receives power from the fuse block ignition 1 voltage. Ground is provided by the ground circuits through the underhood accessory wiring junction block to G101.