Coolant temperature sensor

Tiny
DREW822
  • MEMBER
  • 1999 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140 MILES
How to tell if a temp sensor is bad? Where is it?
Thursday, August 21st, 2008 AT 1:52 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
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.
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Saturday, September 18th, 2021 AT 9:05 PM

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