Where is the coolant temp. sensor on 2009 TB - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 09-09-2019, 06:36 AM
Jim_Owens Jim_Owens is offline
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Where is the coolant temp. sensor on 2009 TB

This light recently came on and I had to pull over to see what it meant. Well the A/C stopped when that happened and I noticed the temp gauge went to zero. After some research I figured out it's probably a coolant temperature sensor. I looked on YouTube for some how to videos and every one I saw indicated the sensor is on the drivers side next to the thermostat. But all those videos were on '05 or '06 TB. Then I read something that said in the '09 TB the sensor was located on the passenger side somewhere on the engine block. I have searched everywhere and can't find a definitive answer. Does anyone know if it changed locations in the later model years? And if so where is It? Thank you!

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Old 09-09-2019, 08:29 AM
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TB-Al TB-Al is offline
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2007 Chevy TrailBlazer LS
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I believe it is on the rear top passenger side. Hopefully this is your engine since you didn't say which engine you had.
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Old 09-09-2019, 09:23 AM
Jim_Owens Jim_Owens is offline
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I have the 4.2 liter. Is that what this diagram is? Thanks so much for your response! I'd like to know where you found that diagram.

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Old 09-09-2019, 09:37 AM
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TB-Al TB-Al is offline
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That should be the correct diagram. It comes from Chiltons. Public libraries often allow online access to paid subscription databases if you have their library card. I have cards for 2 libraries that allow access to Chilton. Chilton is terrible compared to a shop manual but it is better than nothing.
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Old 09-11-2019, 07:14 PM
RPatton76 RPatton76 is offline
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For 4.2L I found it on my 2008 to be at the far back top of the head, and a very big pain to get to especially with tools. After lots of stuff like changing it out and buying a refurbished cluster (and having the same low coolant code, sometimes), I just hook up my code scanner and clear the code each time it popes up. Then the A/C and the temp. gauge both work again, until the next time. Otherwise, I cleared codes by pulling battery cable before I figured out to use the scanner every time.

Rob in AZ
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Old 09-11-2019, 10:39 PM
tandree tandree is offline
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Mine does the same thing. Temp gauge drops to zero, but next day or so it starts working again. 08-Trail Blazer
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Old 09-12-2019, 01:08 PM
bburris69 bburris69 is offline
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You may want to check your thermostat. I had the same problem on my 08 Trailblazer. Sometimes my temp gauge would register, other times not. This caused my a/c not to work. Took it in to have it looked at and my thermostat was sticking. Had it replaced and it is working perfectly now.
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Old 09-13-2019, 11:42 AM
rums2sun rums2sun is offline
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I had the same problem. I noticed that my temp gauge was reading below the middle temp reading indicating the thermostat was stuck open. This is what was causing the A/C to go out and the temp gauge reading zero.

Replace the Thermostat first before messing with the sensors as I was told that the computer may need reprogramming with a new sensor installed.

Just a new Thermostat solved my problem.
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Old 09-13-2019, 11:58 AM
RPatton76 RPatton76 is offline
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When my light would go on, it was suggested that I do the thermostat (last "winter"), but the heater worked great. In our case, I figured it was not caused by the thermostat since clearing the codes made it read correctly and the heater worked great, etc.

Rob in AZ
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Old 09-13-2019, 12:11 PM
rums2sun rums2sun is offline
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Before I replaced the Thermostat I would disconnect the battery for a while to reset the computer and everything worked fine for a while until the next failure.

I did not think it was Thermostat either until I had it replaced and the Temp Gauge started reading in the middle again.
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