Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner

1 - 10 of 10 Posts

·
Registered
2005 chevy trailblazer_ls_ext
Joined
·
10 Posts
Discussion Starter #1
Hi I have an 05 ext with 207K, the coolant sensor gauge worked when I first bought it a couple years ago, then sometimes it would not work and the needle would sit at the left at zero. Now it has not worked at all for quite a while, just sets pegged to the left. Is this more likely to be the sensor or the gauge? Seems like when the sensor goes out the needle usually bounces around, it might have done this but I don't remember this.
 

·
Registered
2004 gmc envoy_slt
Joined
·
2,144 Posts
I would try changing the sensor first. When the stepper motors fail, they usually cause the gauge needle to go to out of range areas.
 

·
Registered
2005 chevy trailblazer_ls_ext
Joined
·
10 Posts
Discussion Starter #3
Thanks for the reply, yeah it was sounding like the sensor from what I have read, I wonder if anyone has been able to replace the sensor without taking out the alternator.
 

·
Registered
2006 chevy trailblazer_lt
Joined
·
2 Posts
If you change the sensor, change the thermostat too. Same area and probably needs it anyway. But before that, have someone do a gauge sweep with a scan tool. They can see if the sensor is sending a signal to pcm also.
Hth
 

·
Registered
2008 chevy trailblazer_lt
Joined
·
63 Posts
If you also have a check engine light and a code for coolant being too cold, then I would clear the code and see if it's like mine and the gauge starts working each time. Good luck.
 

·
Registered
2005 chevy trailblazer_ls_ext
Joined
·
10 Posts
Discussion Starter #7
If you also have a check engine light and a code for coolant being too cold, then I would clear the code and see if it's like mine and the gauge starts working each time. Good luck.
That's funny, I did get that code once, p0128, cleared it and I don't think it has come up again, but the gauge has not worked either.
 

·
Registered
2003 chevy trailblazer_ls
Joined
·
446 Posts
Hi I have an 05 ext with 207K, the coolant sensor gauge worked when I first bought it a couple years ago, then sometimes it would not work and the needle would sit at the left at zero. Now it has not worked at all for quite a while, just sets pegged to the left. Is this more likely to be the sensor or the gauge? Seems like when the sensor goes out the needle usually bounces around, it might have done this but I don't remember this.
What you need to do is not just start changing parts. Get a scan tool and see what it says the temp is. If it reads normal then it's the gauge, it it reads crazy then it's the sensor.
 

·
Registered
2005 chevy trailblazer_ls_ext
Joined
·
10 Posts
Discussion Starter #9
seems like it was normal temp but I will check it again when I get a chance that won't be until around xmas the vehicle is with my parents who live a ways from me
 

·
Registered
2008 chevy trailblazer_lt
Joined
·
63 Posts
I can tell you that when it happened to me, I did the sensor/sender and I thought it was fixed. Then I did the cluster, for $200-ish, (plus $200+ deposit) and it also seemed fixed, for a day or two. But, for me, it always reads fine again after clearing the code, but it'll stop reading again 5 minutes or 5 days later. I suspect the ECM for mine, but I don't know what else "converts" the sender reading into the CAN BUS stuff. Good luck.

Rob in AZ
 
1 - 10 of 10 Posts
Top