| OEM Issues Original Equipment Repairs and/or Problems |
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12-11-2010, 05:28 PM
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Junior Member
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2005 GMC Envoy SLE
Summit White 4.2L I6 2WD
Join Date: Mar 2010
Location: Florida
Posts: 31
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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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12-11-2010, 06:59 PM
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Member
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2008 Chevy TrailBlazer LT
Silver 5.3L V8 4X4
Join Date: Sep 2009
Location: Charlotte, NC
Posts: 106
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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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Copper93
Charlotte,NC
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12-11-2010, 08:21 PM
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Member
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2005 GMC Envoy SLT XL
Liquid Silver Metallic 4.2L I6 4X4
Join Date: Oct 2009
Location: Burlington, ontario
Posts: 133
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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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12-11-2010, 09:56 PM
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No longer with us
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
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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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01-27-2011, 07:19 AM
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Junior Member
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2003 Chevy TrailBlazer LTZ
two tone 4.2L I6 4X4
Join Date: Sep 2009
Location: Middletown, OH
Posts: 2
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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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01-27-2011, 10:27 AM
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Senior Member
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2004 Chevy TrailBlazer LT
Medium Red Metallic 4.2L I6 4X4
Join Date: Apr 2008
Location: Canada
Posts: 996
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Stepper motor. It is safe to drive if there are no other symptoms of overheating.
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01-27-2011, 10:38 AM
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TrailVoy Alumni
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2004 Chevy TrailBlazer LS
Graphite Metallic 4.2L I6 4X4
Join Date: Feb 2007
Location: Wisconsin
Posts: 1,030
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Quote:
Originally Posted by Chickenhawk
Stepper motor. It is safe to drive if there are no other symptoms of overheating.
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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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PCM4Less.com Tune (mild)
De-racked
quad-beam'd
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01-27-2011, 12:42 PM
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TrailVoy Alumni
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2004 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: Fairfax, VA
Posts: 1,298
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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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01-28-2011, 08:39 AM
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Junior Member
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2003 Chevy TrailBlazer LTZ
two tone 4.2L I6 4X4
Join Date: Sep 2009
Location: Middletown, OH
Posts: 2
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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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01-28-2011, 08:47 AM
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TrailVoy Guru
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2006 Chevy TrailBlazer SS (LT)
White 402ci Other AWD
Join Date: Jun 2005
Location: clearwater fl
Posts: 5,896
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Quote:
Originally Posted by christo829
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.
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Quote:
Originally Posted by chimes
my situation (the guage not returning to zero) make it a stepper motor issue?
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the gauge is stuck. a scanner will tell you what the actual temp is if you are leery.
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