Please adjust ur details info...starting in 2006..the temp sensor is located on the passenger side of the block..opposite side from thermostat... looks like a lot of people following ur info and doing work for no reason since sensor isn't there anymore
dunno if you guys gives a damn but if you guys are bored like me during the covid times then you can watch pretty much all the latest movies on InstaFlixxer. Have been binge watching with my brother for the last couple of days =)
Awesome video. Only thing I would suggest is to go ahead and change thermostat as well. They both can cause the po128 code. Not to mention it’s cheap and easy
In addition to the crow's foot, they make special sensor wrenches that are notched to allow the wires through. I got one for my 02 sensor and it looks like it would work on this thing too
@@fsu3784 hahaha, me too my friend. I heard someone modified a 15mm deep socket to look like an 02 sensor socket. Maybe? Still difficult, PIA, can't even get my small hands in there!
You're the man! 4 years later your video is helping us trailblazer riders to avoid mechanics! I'm going to change my thermostat while I'm in there! Everything in this vehicle is cramped in there lol
I saw underneath this will work for a 2008 saab 97x 4.2 also. This morning when i left for work my temp gauge wasnt working at all, it stays at cold so i suspect this is the issue as the fan still kicks on and it didnt over heat. So would this be the fix to get my temp fauge working again? All fuses are good it just wont move off cold, i still have good heat also.
I have same exact trailblazer and the sensor is way back on the back of the dam engine! Like under the windshield! WHERE IN THE HELL IS THE VIDEO OF THAT ONE??
Great video. Thank you. I PB Blaster the crap our of all the bolts I deal with as soon as I have access to them so I can hopefully prevent breaking one off. Glad the temp sensor itself has a hollow core so you could easy-out it. That could have been nasty. Again, great videos on both the thermostat and the coolant temp sensor replacement! Nice video and editing work.
I'm confused now. I have p0128 code and I watched another video of a guy replacing the thing below what you did. The metal pipe that attaches to the hose. Idk which to replace now. Should I do both?
I think I'm starting to regret buying this 2008 trailblazer. I haven't owned it for 2 weeks and the steering wheel angle sensor went out. That was $480.... Now my "check gauge" light is on, and the temp guage is at zero.... But I do have heat. This looks like a real easy fix .....SMH. BUT! I live in Detroit and some piece of shit stole my Tahoe with the 5.3, so I guess I'll just have to deal with it.
I just changed my thermostat and was going to change the temp sensor also. Couldn't find it, looked and looked didn't find it. Came back in the house and watched the video again and mine is not in the same location. Have the same year and engine as in the video. So I put it all back together.
If you pull the alternator off you will have easy access to the coolant temperature sensor and the thermostat. I used a 19mm open end wrench to take out the old and put in the new coolant sensor.
Have 2008 trailblazer Lt, followed all the steps and low and behold the sensor is not there. So the video was not useful for the sensor so changed the thermostat instead which is there, and that cured the engine light problem, so didn't change the sensor which is actually on the other side of the engine.Good video though.
@@E4EonEbay Hi there, yes it does have the Vortec 4.2 engine. You can see where it should be but it is now solid. I bought both the sensor and the thermostat because if I was going to take out the alternator then was going to do both at same time. Didn't have to take battery out but putting the third screw at the underside of the alternator was very difficult because of a hose that stopped the wrench going over its head. I hardly do any work on cars and followed your video and it was perfect. I believe the sensor is on the passenger side of the engine and somebody else commented that it still difficult to get to.Thanks.
@@alisonkirton8377 I got a 08 too, but I'm wondering what made u change ur sensor? My temperature gauge wouldn't show any movement after heating up the SUV and ac wasn't working and I was told to change the temp sensor...was it more troublesome to change it on the passenger side of the engine?
Nice video, thank you. You mention it had a check engine light on, what was the cause of the Check engine, what was it doing? I ask because my truck is over heating just a lil bit, it goes up 2 notches/lines from 210 on the temperature gauge but I have no check engine light on so I’m wondering could this sensor be the cause.
Would a malfunction in this sensor cause a high idle of 950, 1000 RPMs? This is my last resort and am gonna eliminate this issue anyways. Just wanted to know why you would change this component in the first place.
Absolutely! Have you ever noticed the fast idle when you first start up your vehicle and the coolant temperature is the same temperature as the ambient outside air temperature? If you live in a cold climate, this could go on for several minutes. The PCM will increase the engine idle according to the coolant temperature sending unit and quite possibly the intake air temperature sensor as well. So if your coolant temperature sensor is bad and sending a low temperature reading to the PCM, it could cause a higher than normal engine idle. But don’t just focus on that, you also have an idle air control valve that could be causing a high idle.
Steve Young, what's the normal temperature for 2002 Chevrolet Trailblazer, LL8-ENGINE, 4.2L, DOHC, L, MFI, 6-CYLINDERS? I feel like my car has overheating engine. My Chevrolet Trailblazer is more than 125 degrees Celsius see the picture of the gauge of my Trailblazer at this link: i.postimg.cc/QCR9hgpj/Inked-TEMPERATURE-LI.jpg
I have a Chevy 2003 Trailblazer with overheating problems I turns to thermostat flush the radiator with a fan clutch brand new water pump still overheating
Hi I change the water pump thermostat flushed radiator put a brand new fan clutch and it still overheating can you tell me what possibly could be the problem
Thank you for posting this video. I have a 07 trailblazer that surges upon cold startup outside temp around 30 degrees. I was wondering if this is the fix. No check engine light present.
@@amartinez2071 After taking it to a reputable shop it turned out to be the mass air flow sensor. Which I had replaced 6 months ago due to hunting for a fix for improper voltage code on MAP sensor. The cheaper version I bought failed causing this crazy ordeal. Thanks for your response.
I did not drain the coolant before changing the sensor, you will lose a little coolant when taking it out, just have the other in your hand ready to thread in and it will minimize the amount of loss. Thank you for watching and commenting!
That's the thermostat not the temp sensor 🤔 the Trailblazer 4.2L engine does have an Engine Coolant Temperature sensor. It is located on the passenger side of the engine, next to the last exhaust port near the firewall. It is a two wire sensor. I looked it up😜 Pretty good video though 👍
Yeah it is, 02-05 that's the correct location and temp sensor. 06+ it's on the passenger side wayyyyy in the back on the block. Agree, good video using the crows foot.
@@ryanlutton8193 it would be nice if they did not change so much shit around. My 07 has no pet cock for the radiator and no cabin filter. And the damn fuel filter is in the gas tank 🙄😳.
That's not a thermostat... It's a sensor. Thermostats don't have wires coming out of them, and they have a spring that moves to open and close the coolant channel.
after changing the temp sensor your light should go out if it was on for that reason, but you may still need a code reader to reset and clear the code, as it might still be stored in the computer even with the light out. thanks for watching and commenting.
@@E4EonEbay yea have a diagnostic tool and this is the code P0128, "engine coolant temperature below thermostat regulating temperature.." i will replace it.
