Temperature Gauge: Testing and Inspection

Engine Coolant Temperature Sensor:

1. Disconnect the coolant temperature sensor.
2. Turn ignition switch ON. The temperature gauge should be at its lowest position. Turn ignition switch OFF.
3. Ground temperature gauge sending unit connector Pin 3. Turn ignition switch ON. The temperature gauge should be at its highest position. After the seat belt lamp goes out, the cluster should chime for about eight seconds.
a. If OK, check temperature sending unit connector for proper connection. If connections are OK, replace the sending unit.
b. If not OK, and the high temperature chime sounds but the gauge shows cold, replace the gauge assembly If gauge is still not working, replace the printed circuit board.