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Location of temperature sensor on a 2003 trailblazer

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  • Chevrolet Master
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The coolant temperature sensor is located next to the thermostat, behind and below the alternator.

Posted on Nov 27, 2010


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Posted on Jan 02, 2017

  • 1796 Answers

SOURCE: is your 2002 trailblazer speed sensor located


The speed sensor is located on top or the transmission, towards the back end.

Don't forget to rate this post!!

Posted on Jul 23, 2010

  • 34 Answers

SOURCE: 2003 Audi A4 Quatro, 1.8 Cooant Temperature Sensor

The sensor you have described is the radiator coolant temp sensor, the one you want (that often becomes faulty) is located directly at the back of the engine on a pipe between the engine and the bulk head. It is very tight to get to. The sensor is usually green or black, you will need to use a very long flat blade screw driver to remove the 'c' shaped clip (I think its the same clip you would of seen on the rad) I reccommend you try and get a spare clip as they can be easily dropped! With the clip out you can ease the sensor up and out, its prob easier to leave the connector on untill removed. Replace the seal if possible. When refitting the new sensor ease it in gently to avoid damaging and put the clip in which ever way is easier (if i remember correctly the clip can go back in the other side to which it came out- this way is much easier!) Hope this helps.
Avoid doing it when the cars hot, and even if its warm release the pressure by undoing the coolant bottle cap carefully. You shouldnt lose too much coolant when changing sensor. Let me know if you want anymore info.

Posted on Mar 16, 2009

  • 37 Answers

SOURCE: locate camshaft sensor 2002 chevy trailblazer

Assuming you have a 4.2L engine here is the location.

Hope this helps out,
if so please rate my answers.

Posted on Mar 19, 2009

  • 155 Answers

SOURCE: How do I change the temperature sensor under the

It’s located on the driver’s side of the engine on top /side of the head.. midway.. I don’t think you need to remove the engine cover to see it.. if it is the correct one it will have a dark green top.. the bad version has a black top… but they can all go out to lunch on you if old enough.

To replace.. make sure the car is cool..
You need a hood tool.. or small pair of pliers to remove the retaining clip that holds it in place.
Place a rag under and around it to catch the coolant.. you will lose less than a half a cup.. if that.

Pull the retaining clip back toward you.. try not to drop it.. (another good reason for the rag)

Wiggle the sensor.. pop it out.. and replace with the new green top one make sure you clean the area well.. and when you reinstall the new one that the c clip goes back on straight or it will leak.

Once you see the part out of the box.. you will understand how it works

Start the car.. check for leaks.. run until warm with the heater on.. top up the coolant overflow bottle with distilled water.. (if more than a half a cup.. you should mix the proper anti freeze and distilled water and then top up with that)

Good luck

Posted on May 06, 2009

  • 5763 Answers

SOURCE: The outside air temperature sensor for the 2003 Camry

the sensor is located in front of radiator if you open hood and look down behind front bumper you should see it, or look from under the frt bumper, it easy to change, also get part from dealer it not $$,hope this helps.

Posted on Nov 28, 2009

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2003 trialblazer temperature sensor

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Do you need to replace the thermostat housing if only the sensor is bad and telling the conputor to turn on the service engine light?

How do you know the sensor is bad? Have you checked the coolant temperature using an external temperature gauge?
Best bet is to replace both the thermostat/housing and the temperature sensor, they are not that expensive, and are located in the same area of the engine.

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Where is the speed sensor located on a 2003 Chevy trailblazer?

2003 chevy trailblazer where is the speed sensor location

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Check the wiring and connections on the coolant temperature sensor that I believe is on the thermostat housing. If they look good, replace the sensor. It is pretty rare to have an electric cooling fan motor fail but not impossible. They are usually very expensive. Expensive enough that you will want to make sure that is the problem before you replace it. Usually the sensor will fail. **Please rate me on this answer.**

Jun 24, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Check engine light comes on. diagnostic test

Never heard of a thermostat sensor. There is a diagnostic code that wil lbe set if the engine computer observes that the thermostat is not allowing the engine to reach operating temperature quickly enough. This code is based on information sent by the engine coolant temperature sensor. 99.9% of the time a new thermostat solves the problem. Use an AC Delco thermostat.

Dec 30, 2009 | 2003 Chevrolet TrailBlazer

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Coolant temperature sensor location on 2000-2005 4.8L, 5.3L, 6.0L engines

Hope helped with this (remember rated) Good luck.

Nov 23, 2009 | 2005 Chevrolet TrailBlazer

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Where is the engine coolant temperature sensor located 2003 chevy trailblazer

ON the passenger side of the engine, in the head above the exhaust manifold in the very back of the engine. Hard to see and hard to get to. Pull the air filter top cover and the pipe that goes to the big box on top of the engine, then pull the big box off of the engine then you'll be able to see it alittle.

Oct 20, 2009 | 2003 Chevrolet TrailBlazer

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