Coolant temperature sensor

Tiny
MLYAGERS5
  • 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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Wednesday, October 13th, 2010 AT 10:45 AM

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Tiny
2CARPROS KEN
  • ADMIN
  • 12,124 POSTS

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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Saturday, October 21st, 2017 AT 1:01 PM
Tiny
NHILTON1
  • 2005 CHEVROLET TRAILBLAZER
  • 106,888 MILES

The engine is a V6, and the upper radiator hose is slightly to the passenger side, and hubby says the thermostat is there, I can't seem to find the sensor, a picture would be great if you have one, as I am going insane and want to fix it in the morning myself. Any help would be greatly appreciated. What all do I need to take apart, the videos on youtube does not help either they are not car specific.

I would make a donation if I could, I have already spent a fortune on this vehicle as you can well guess from all of the issues that the Trailblazers have.

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Saturday, October 21st, 2017 AT 1:01 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
  • 31,190 POSTS

Left front of engine block near alternator its screwed into the head no specials tools just a deep socket.

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Saturday, October 21st, 2017 AT 1:01 PM (Merged)
Tiny
NHILTON1
  • MEMBER

But you need more tools I assume you have to remove the alternator

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Saturday, October 21st, 2017 AT 1:01 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
  • 31,190 POSTS

Do you have the 4.2L or the 5.3L engine?Because I just caught you out V6 as the engine I thought you put V8 so thats the location I gave the sensor for. The trail blazer has a inline 6 or V8 engine. If you have a 6 cylinder is a inline 6.

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Saturday, October 21st, 2017 AT 1:01 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
  • 31,190 POSTS

The diagram I posted is for the inline 6 4.2L engine callout nuber one is the connector going to the coolant temp sensor.

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Saturday, October 21st, 2017 AT 1:01 PM (Merged)
Tiny
DUPP
  • 2003 CHEVROLET TRAILBLAZER
  • 123,000 MILES

Had diagnostic performed two different times and was told both times it is the coolant level sensor showing up. Coolant levels are full. Replacement part I bought is smaller than my pinkie finger.

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Saturday, October 21st, 2017 AT 1:03 PM (Merged)
Tiny
DOCFIXIT
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  • 18,982 POSTS

That would be in coolant recovery tank

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Saturday, October 21st, 2017 AT 1:03 PM (Merged)
Tiny
BIKERTHUG
  • 2003 CHEVROLET TRAILBLAZER

Engine Cooling problem
2003 Chevy Trailblazer 6 cyl Two Wheel Drive Automatic 64000 miles

where is this coolant temp sensor located

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Saturday, October 21st, 2017 AT 1:04 PM (Merged)
Tiny
BLACKOP555
  • EXPERT
  • 10,535 POSTS

Front right engine block near the generator. See picture bellow.

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Saturday, October 21st, 2017 AT 1:04 PM (Merged)
Tiny
BLACKOP555
  • EXPERT
  • 10,535 POSTS


http://www.2carpros.com/forum/automotive_pictures/66751_ects_1.jpg

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Saturday, October 21st, 2017 AT 1:04 PM (Merged)
Tiny
BIKERTHUG
  • 2003 CHEVROLET TRAILBLAZER

Engine Mechanical problem
2003 Chevy Trailblazer 6 cyl Two Wheel Drive Automatic 64000 miles

where is the coolant temp sensor located

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Saturday, October 21st, 2017 AT 1:04 PM (Merged)
Tiny
IMPALASS
  • EXPERT
  • 3,128 POSTS

Hello - bikerthug

Here is the info you requested

Hope this helps.

If you would like to offer feedback on your experience with me/us - feel free to go into the blue "Give Feedback" area under ImpalaSS


http://www.2carpros.com/forum/automotive_pictures/248015_102980753_1.jpg



ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT

REMOVAL PROCEDURE

NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

Turn the engine OFF.
Disconnect the negative battery terminal. CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
Drain coolant below the level of the ECT sensor. Refer to Draining and Filling Cooling System (Body Vin Code 6)Draining and Filling Cooling System (Body Vin Code 3) in Cooling System.


http://www.2carpros.com/forum/automotive_pictures/248015_1_29.jpg



Disconnect the ECT sensor electrical connector (1).
Remove the drive belt and the generator.


http://www.2carpros.com/forum/automotive_pictures/248015_2_21.jpg



Carefully remove the ECT sensor (1).
INSTALLATION PROCEDURE

NOTE:

Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.
If installing the original sensor or a new sensor without sealant, apply thread sealer P/N 12346004 or equivalent.


http://www.2carpros.com/forum/automotive_pictures/248015_3_18.jpg



Install the ECT sensor. NOTE: Refer to Fastener Notice in Service Precautions. Tighten Tighten the ECT sensor to 16 N.m (12 lb ft) .


http://www.2carpros.com/forum/automotive_pictures/248015_4_9.jpg



Connect the ECT electrical connector (1).
Install the generator and the drive belt.
Connect the negative battery terminal.
Refill the engine coolant. Refer to Draining and Filling Cooling System (Body Vin Code 6)Draining and Filling Cooling System (Body Vin Code 3) in Cooling System.

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Saturday, October 21st, 2017 AT 1:04 PM (Merged)
Tiny
SAEED2014
  • 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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Saturday, October 21st, 2017 AT 1:04 PM (Merged)
Tiny
KNOWLEDGE IS POWER
  • EXPERT
  • 1,157 POSTS

Ive sent a pic of the temp sensor. Your trailblazer shouldn't have an air pump. Id start with the coolant temp sensor.

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Saturday, October 21st, 2017 AT 1:04 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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Saturday, October 21st, 2017 AT 1:04 PM (Merged)
Tiny
2CARPROS KEN
  • ADMIN
  • 12,124 POSTS

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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Saturday, October 21st, 2017 AT 1:04 PM (Merged)

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