Location of coolant temperature sensor?

Tiny
NASSAUBLUE
  • MEMBER
  • 2003 SATURN ION
Where is the coolant temperature sensor?
Thursday, May 13th, 2010 AT 2:42 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
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.
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Friday, September 24th, 2021 AT 1:42 PM

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