Coolant Temperature Gauge

Disconnect harness connector at coolant temperature sending unit. Connect a 12-volt, 3.4-watt bulb (light) between ground and Yellow/White wire at coolant temperature sending unit harness connector. Turn ignition on. Ensure bulb lights and temperature gauge needle fluctuates several seconds later. If gauge does not function as specified, check fuses, wiring harness, connectors and instrument panel circuit board. If all components are okay, replace coolant temperature gauge.