coolant temperature sensor

1999 JEEP CHEROKEE
140 MILES • 6 CYL • 4WD • AUTOMATIC
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DREW822
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how to tell if a temp sensor is bad? where is it?
Aug 21, 2008 at 1:52 AM
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SQM
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Hello,

Remember to only work on the cooling system when the engine is cool.

The coolant temperature sensor is located on the thermostat housing (see diagram below).
To test the coolant temperature sensor you will have to check the resistance between the two pin that is on the back of the sensor.
As for the resistance value it will depend on the temperature of the sensor. I have attached the chart for the resistance range for a given temperature.

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor
https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Please let me know of any questions.
Thank you.
Sep 18, 2021 at 9:05 PM