Coolant temperature sensor location

Tiny
MADEINTXS
  • MEMBER
  • 2008 CHEVROLET TRAILBLAZER
  • 2.1L
  • V6
  • 2WD
  • AUTOMATIC
  • 200,100 MILES
Can’t seem to locate the sensor. Every diagram I’ve looked at shows it in a location that has nothing but metal or screws. Even the dealer couldn’t tell me.
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Saturday, October 26th, 2019 AT 8:08 PM

24 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

I assume it is the 6 cylinder as there is no 2.1 motor.

I attached pictures for you to view. It is at the right rear of the engine.

Roy
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Saturday, October 26th, 2019 AT 8:15 PM
Tiny
MADEINTXS
  • MEMBER
Right meaning passenger side or driver side? There is nothing on top. So, is it underneath the last spark plug? The one that s really hard to get to?
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Saturday, October 26th, 2019 AT 8:23 PM
Tiny
ASEMASTER6371
  • EXPERT
The passenger side at the back of the motor. Yes, it is difficult to access.

Roy
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Saturday, October 26th, 2019 AT 8:33 PM
Tiny
JACQUELINE CELESTINE
  • MEMBER
  • 2007 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • AUTOMATIC
  • 217,000 MILES
Can someone tell me exactly where ECT sensor is located on the vehicle? A color pictures would help or a video showing exactly what to do. Thanks.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
Temperature sensors have an extremely low failure rate because there is just one part inside them. What kind of problem are you trying to solve?
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
JACQUELINE CELESTINE
  • MEMBER
I took the vehicle in too dealership because it kept shutting off. They put it on diagnostic machine and the code it through out. And check engine light is on. I am not good with diagram. I really want to know exactly where it is at on the vehicle. I thought it was behind alternator but I did not see it there.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
First you need to list the exact diagnostic fault code number. There are multiple codes for temperature sensors, and they mean very different things.

Also be aware that fault codes never ever say to replace a part or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a part is referenced in a fault code, it is actually the cause of that code about half of the time. Before we waste your money on a part, we have to rule out wiring and connector terminal problems, and mechanical problems related to that part.

The coolant temperature sensor is number three on the drawing. It sits just under the valve cover, and just above the exhaust manifold. The arrow at the top left is pointing toward the front of the vehicle, so this view should be as though you were standing just behind the passenger-side front wheel. The sensor will be at the rear of the engine, on the passenger side.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
JACQUELINE CELESTINE
  • MEMBER
Thank you so much.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
KEN
  • ADMIN
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
SAEED2014
  • MEMBER
  • 2007 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 95,389 MILES
Im trying to replace the coolant temp sensor on my 07 trailblazer lt 4.2L ive looked at past posts on this site that say it is just above the thermostat but its not there from what I can tell its on the back of the motor on the passanger side any ideas how the best way to change this would be very helpful reason for replacing is im have a problem with the idle jumping while parked or sitting at stop light took it to dealer hoping it would be under warranty they say it is the thermostat, coolant temp sensor, air pump, and the air pump check valve
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
KNOWLEDGE IS POWER
  • EXPERT
I would start with the coolant temp sensor.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
JACQUELINE CELESTINE
  • MEMBER
I sure will.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
JOSE RAUL VASQUEZ ENCINAS
  • MEMBER
I now need to know if the engine of the 2005 model has the sensor in the same place as 2006. Thank you
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
KEN
  • ADMIN
Hello,

Yes the sensor is in the same place.

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
MLYAGERS5
  • MEMBER
  • 2007 CHEVROLET TRAILBLAZER
Electrical problem 6 cyl Two Wheel Drive Automatic

Where is the coolant temp sensor located on this engine?
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
KEN
  • ADMIN
Hello,

Here is the coolant temperature sensor for both engines and a guide to give you an idea of what you are in for when doing the job.

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

Here are the diagrams (below)

Please let us know what happens.

Cheers, Ken
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
MARKHUNT09
  • MEMBER
  • 2006 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Could I please be told where the ECT sensor is located for my vehicle it is the LS model? I need to replace mine due to a P0128 code. I watch a video on YouTube but It was For a 2005 Blazer.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
P0128 - ECT below thermostat regulating temperature,

Coolant temperature sensors are usually near the thermostat housing. Code 128 is set from the readings from a properly-working coolant temperature sensor.

I tried multiple times to resize the image, but it always comes out the same. The CTS is item number 1. I added a red arrow pointing to it.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
HEYMAN1104
  • EXPERT
If you do not mind me jumping in here, I would suggest putting in a new thermostat with the OEM temperature rating. My Blazer throws this code when I am running a lower temperature thermostat or when the thermostat fails and gets stuck in the open position. The engine coolant is at too low of a temperature.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)
Tiny
MARKHUNT09
  • MEMBER
I am still having slight trouble locating the CTS. I took pictures and videos to try to help out.
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Monday, November 2nd, 2020 AT 3:19 PM (Merged)

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