Coolant Temperature Indicator

If the lamp is not lit when engine is being cranked:
- check for a defective bulb,
- open in the light circuit,
- or a defective ignition switch.

If the lamp is lit when the engine is running:
- check for overheated cooling system,
- defective temperature switch,
- or wiring between lamp and switch for short to ground.

Additional diagnostic information can be found at Body Control Module, Testing and Inspection, Diagnostic Charts. Testing and Inspection