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  #1  
Old 03-15-2019, 02:22 PM
gtk3 gtk3 is offline
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2008 Chevy TrailBlazer LT
Black Granite Metallic 4.2L I6 4X4
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Location: Frederick, MD
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Check gages warning light

2008 Trailblazer 80,000 miles. So its 25 degrees outside im on a interstate going 65. Light comes on, didnt even know it existed. Manual says to check coolant and oil gages to see if they are in the warning zone. The temp gage is at 100. Im getting plenty of heat so Im thinking something weird is going on. After about 45 miles it goes off and the temp gage goes back to normal. About 20 miles later it comes on again but goes off. Been ok since. Service StabiliTrak came on in the last 20 miles also. Started it the next day and everything was fine. Plugged in a code reader. Nothing! Anybody have any idea whats going on?
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  #2  
Old 03-16-2019, 10:49 AM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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Since it would be highly unlikely that the engine coolant temperature would actually go to 100 degrees while engine is operating, I would suspect a bad temperature sensor, intermittent wiring or a cluster stepper motor.

As far as the Stabilitrak light is concerned, there are a number of devices that could set that; weak or intermittent front wheel speed sensor, steering wheel angle sensor, speed sensor on transfer case or wiring.

Most of these would need a scan tool to verify.
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Old 03-17-2019, 01:56 PM
gtk3 gtk3 is offline
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2008 Chevy TrailBlazer LT
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Originally Posted by EnvoyBoy2004 View Post
Since it would be highly unlikely that the engine coolant temperature would actually go to 100 degrees while engine is operating, I would suspect a bad temperature sensor, intermittent wiring or a cluster stepper motor.

As far as the Stabilitrak light is concerned, there are a number of devices that could set that; weak or intermittent front wheel speed sensor, steering wheel angle sensor, speed sensor on transfer case or wiring.

Most of these would need a scan tool to verify.
Thank you for the reply, it makes sense its some kind of sensor or wiring issue. I had plenty of heat when it was 25 outside. The light concerned me though. If it comes on again is there any chance it will shut down the engine next time I try to start it? My code reader did not indicate any problems.
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Old 03-17-2019, 02:43 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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What light are you referring to? There are many warning lights on the dash.
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Old 03-17-2019, 04:13 PM
gtk3 gtk3 is offline
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2008 Chevy TrailBlazer LT
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Originally Posted by EnvoyBoy2004 View Post
What light are you referring to? There are many warning lights on the dash.

Check gages warning light and the temp guage that went down to 100 while it was on
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Old 03-22-2019, 09:50 AM
Scott Branson Scott Branson is offline
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Originally Posted by gtk3 View Post
Check gages warning light and the temp guage that went down to 100 while it was on
Might be related, might not. When the water pump was going out on my 07 Trailblazer it would cause one of the warning lights on the dash to come on. Been about 3 years back so I don't remember exactly which one unfortunately.

With a lot of research I tracked down the that the wobble in the failing water pump shaft was actually causing the system to detect a fault in the fan clutch. After a lot of head scratching figuring out how to get the water pump off without disassembling the entire front end and replacing it, the warning light quit coming on even though I put the old fan clutch back on.

While the bad water pump was still on, my coolant gage would fluctutae a lot. What I think was happening is that it would usually circulate just fine but occasionally quit circulating, my temp gage would climb up to the overheat zone as the coolant got hotter and hotter, then it would suddenly drop to about half of normal as the coolant started circulating again allowing the now "over cooled" coolant that had been trapped in the radiator to flow.

Long story short. A failing water pump can cause a fault light for the fan clutch and cause temp gage fluctuations between normal, hot, cool.
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