2008 Chevy Trailblazer Coolant Temperature Gauge

Tiny
OLHARRELL
  • 2008 CHEVROLET TRAILBLAZER

Engine Cooling problem
2008 Chevy Trailblazer V8 Two Wheel Drive Automatic 49000 miles

2008 Trailblazer SS 6.0L V8

Twice coolant temperature gauge has failed to register pass 100F. After approximately 10 minutes driving time, gauge warning light came on and AC quit working. Engine is not overheating. Dealer replaced thermostat after first occurence. Problem came back few weeks later but self corrected - gauge started working, warning light went out and AC came back on. Gauge readings are erractic at times - between 165 and 210 ( 1/4 mark to 1/2 mark on scale ). Gauge never reads past 220. Any ideas on problem?

Do you
have the same problem?
Yes
No
Monday, October 11th, 2010 AT 3:06 AM

10 Replies

Tiny
SSALEH2002
  • MEMBER

Good day,

the same problem happen to my Trailblazer, the dealer have change the coolant temperature sensor, water pump and also the dealer try to fix wires lose but it does not fix the problem. Could it be because of the battery?

Was this
answer
helpful?
Yes
No
-1
Wednesday, November 2nd, 2011 AT 10:17 PM
Tiny
HAROON1
  • MEMBER

I have Chevrolet TrailBlazer LS 2008 ( American Version ) having 65000 miles
.
I am facing problem of dropping of temperature gauge while driving. It comes automatically down after some time during driving. One of the mechanic has replaced temperature sensor but problem still persists. Moreover, once temperature needle goes down to zero during driving, Airconditioning COOLING system also stops working during that period. Sometimes temperature needle works perfectly fine and sometimes drops automatically during driving. Once mechanic RESET from computer, it becomes ok but again same thing happens after few days. I am really so worried. Please help me to resolve this issue.

Was this
answer
helpful?
Yes
No
-2
Thursday, March 13th, 2014 AT 1:58 AM
Tiny
12LX200
  • MEMBER

Yep, same problem here! 2008 Trail Blazer Intermittent temp gauge and of course the AC stop by default when that happens. So, . What's the big secret? This thread is listed under. This thread started 6 years ago and there is no answer to this VERY COMMON problem?

Not just here but threads all over the internet with no answer. You can leave off the list Temp sensor / Thermostat / Wiring. It's none of these. LoL!

Hal

Was this
answer
helpful?
Yes
No
-1
Saturday, July 9th, 2016 AT 2:02 PM
Tiny
2CARPROS KEN
  • ADMIN
  • 5,013 POSTS

Hello,

This problem has been traced back to a faulty BCM. The BCM must be replaced or updated to fix.

Even though this fix is straight from the dealer, I think it might be a gauge stepper motor problem.

Please use 2CarPros anytime, we are here to help and tell a friend.

Best, Ken

Was this
answer
helpful?
Yes
No
Tuesday, November 29th, 2016 AT 11:41 AM
Tiny
  • 2008 CHEVROLET TRAILBLAZER
  • 11,100 MILES
  • MERGED

My engine temperature gauge is not working propaly and the dash board give the there is some malfunction error now it's give a check engine sign what shall I do

P.S: My AC also stopped cooling

Was this
answer
helpful?
Yes
No
Friday, December 16th, 2016 AT 3:44 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,372 POSTS
  • MERGED

If the check engine light is on, have the computer scanned to identify trouble codes. That will help you identify where the problem is coming from. Check out the local parts stores. Most will scan the computer for free.

Was this
answer
helpful?
Yes
No
Friday, December 16th, 2016 AT 3:44 PM
Tiny
HAROON1
  • 2008 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
  • MERGED

I have Chevrolet TrailBlazer LS 2008 ( American Version ) having 65000 miles
.
I am facing problem of dropping of temperature gauge while driving. It comes automatically down after some time during driving. One of the mechanic has replaced temperature sensor but problem still persists. Moreover, once temperature needle goes down to zero during driving, Airconditioning COOLING system also stops working during that period. Sometimes temperature needle works perfectly fine and sometimes drops automatically during driving. Once mechanic RESET from computer, it becomes ok but again same thing happens after few days. I am really so worried. Please help me to resolve this issue.

Was this
answer
helpful?
Yes
No
Friday, December 16th, 2016 AT 3:44 PM
Tiny
KNOWLEDGE IS POWER
  • EXPERT
  • 1,163 POSTS
  • MERGED

Id also check the coolant level to be sure its full, and also make sure that the water is flowing in the system. When the needle gets cold, turn on the heater and see if its hot. If not, put your hand on the top radiator hose carefully to check for heat. If that's all hot, then you may have a wiring/ECM issue

Was this
answer
helpful?
Yes
No
Friday, December 16th, 2016 AT 3:44 PM
Tiny
HAROON1
  • 2008 CHEVROLET TRAILBLAZER
  • 6 CYL
  • AUTOMATIC
  • 65,000 MILES
  • MERGED

I have Chevrolet TrailBlazer LS 2008 having 65000 miles
.
I am facing problem of dropping of temperature gauge while driving. It comes automatically after some hours during driving. One of the mechanic has replaced temperature sensor but problem still persists. Moreover, once temperature needle goes down to zero during driving, Airconditioning COOLING system also stops working during that period. Please help me.

Was this
answer
helpful?
Yes
No
Friday, December 16th, 2016 AT 3:44 PM
Tiny
WRENCHTECH
  • EXPERT
  • 20,625 POSTS
  • MERGED

You would have to start tracing circuits down using a wiring diagram but it could like it could be ignition switch related.

Was this
answer
helpful?
Yes
No
Friday, December 16th, 2016 AT 3:44 PM

Please login or register to post a reply.

Related Instrument Cluster Gauge Engine Temperature Not Working Questions