Coolant Sensor Test
Turn ignition off and disconnect wire connector from sensor. Connect ohmmeter leads to sensor terminals. With engine cold and ambient temperature below 90°F (32°C), resistance should read 500-1000 ohms. With a hot engine, resistance should be greater than 1300 ohms. If specifications are not obtained, replace sensor.
NOTE:
The coolant sensor resistance will continually change with changes in engine temperature. It is not a switch.