location of coolant temperature sensor?

2003 SATURN ION
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NASSAUBLUE
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  • 2 POSTS
where is the coolant temperature sensor?
May 13, 2010 at 2:42 PM
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SQM
  • ASE Certified Mechanic
  • 6,383 POSTS
  • ASE Certified Mechanic
Hello,

The coolant temperature sensor is located on the rear side of the engine (see diagram below).
Replacement of the sensor is simple. Just unplug the harness and unscrew the sensor from the engine.
Remember to only work on the cooling system when the engine is cool.

Here are couple of articles that you might find helpful:

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

I have attached the replacement procedure for this sensor as well.

Please let me know of any questions.
Thank you.
Sep 24, 2021 at 1:42 PM
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