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Coolant Temperature Sensor
- Disconnect negative battery cable. Drain cooling system. Disconnect coolant temperature sensor coupler. Remove sensor from intake manifold. Connect ohmmeter to sensor. Immerse sensor sensing part into water.
- Gradually raise water temperature and read resistance on ohmmeter. See Fig 1
. If resistance at each temperature is not equal to graph reading, replace sensor.
Courtesy of GENERAL MOTORS CORP.