Question about 2003 Chevrolet TrailBlazer
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
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
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)
Posted on May 06, 2009
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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