Engine Temp Gauge stays pegged on hot - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 12-11-2010, 05:28 PM
1tm315 1tm315 is offline
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Engine Temp Gauge stays pegged on hot

Anyone know why my 2005 envoy's temp gauge stays pegged way past hot but engine is not overheating? Is there a sensor somewhere that may have failed or is it the gauge??
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  #2  
Old 12-11-2010, 06:59 PM
Copper93 Copper93 is offline
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My guess would be the temp sending unit. I can't advise where it is on your engine. But they are pretty cheap and normally easy to change.
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  #3  
Old 12-11-2010, 08:21 PM
sLAsh sLAsh is offline
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Mine is like that right now because the stepper motor is sticking and not going back to 0. check to see if the gauge drops to 0when cold and if not you need to pull the gauges and replace the stepper motor. If you are doing it you mght as well replace them all
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Old 12-11-2010, 09:56 PM
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the roadie the roadie is offline
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The sensor is next to the thermostat and has been discussed a few times in other threads. A scan tool that can read the sensor data can tell you if it's the sensor or the gauge.
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Old 01-27-2011, 07:19 AM
chimes chimes is offline
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Hello. My temp guage also reads hot on my 2003 Trailblazer. I dont know if I have an overheating problem or a guage issue. When I get in TB, before key inserted, all guages are at resting all the way to the left EXCEPT temp guage which sits like it was 7/8 full (reading like a gas guage). Shortly after driving (mile or two) it goes all the way to hot. I assume guage is incorrect, but am afraid to drive (even to repair shop 15 miles away) in case it is in fact overheated. How do I determine if it is really too hot or just a guage malfunction? If it is only a malfunction of the guage then I assume it would be either the sensor or stepper motor. I read thread on replacing stepper motors on guage cluster but dont know if that is my issue. Any thoughts very much appreciated.
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Old 01-27-2011, 10:27 AM
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Stepper motor. It is safe to drive if there are no other symptoms of overheating.
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Old 01-27-2011, 10:38 AM
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Quote:
Originally Posted by Chickenhawk View Post
Stepper motor. It is safe to drive if there are no other symptoms of overheating.
the ECU reads voltage from the sending unit and triggers the warning light. if you see the light, that's when you shouldn't be running the engine. if not, you're fine.
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Old 01-27-2011, 12:42 PM
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christo829 christo829 is offline
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The fact that when you're stopped and cold, the gauge still
reads a temperature instead of returning to zero says it's the gauge
that's at fault, not your actual temperature.

Stepper motor.

Good Luck!

Chris
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Old 01-28-2011, 08:39 AM
chimes chimes is offline
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Thanks for the replies. I conclude from them that it is not overheating and safe to drive. I am still confused on whether it is definately the stepper motor, or if it could be the sensor? The response by Roadie to the original poster makes me unsure, or does my situation (the guage not returning to zero) make it a stepper motor issue? If it could be either, how do I determine which?
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Old 01-28-2011, 08:47 AM
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Quote:
Originally Posted by christo829 View Post
The fact that when you're stopped and cold, the gauge still reads a temperature instead of returning to zero says it's the gauge that's at fault, not your actual temperature.

Stepper motor.
Quote:
Originally Posted by chimes View Post
my situation (the guage not returning to zero) make it a stepper motor issue?
the gauge is stuck. a scanner will tell you what the actual temp is if you are leery.
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