Coolant temp sensor envoy - 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 10-03-2011, 10:35 PM
envoy03kmv envoy03kmv is offline
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2003 GMC Envoy SLE
Graystone Metallic 4.2L I6 2WD
Join Date: Oct 2011
Location: Parsons KS
Posts: 13
Coolant temp sensor envoy

My 03 envoy was throwing the code for P0128 -Coolant Temp Below Thermostat Regulating Temp. I had changed the T-stat and it didnt help. symptoms are idling VERY high on 1st start in morning the colder the worse. and hard and long shifting in to gears ...i have to ease of the gas to help shift.(shifts fine if manually shifted) whats next? I am going to change the sensor tomorrow. Is that the next best step? Where is it located? Any advise and tips would be awesome! thanks
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  #2  
Old 10-03-2011, 10:42 PM
Ralph_T's Avatar
Ralph_T Ralph_T is offline
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2005 GMC Envoy SLE XL
Imperial Blue Metallic 4.2L I6 4X4
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Originally Posted by envoy03kmv View Post
My 03 envoy was throwing the code for P0128 -Coolant Temp Below Thermostat Regulating Temp. I had changed the T-stat and it didnt help. symptoms are idling VERY high on 1st start in morning the colder the worse. and hard and long shifting in to gears ...i have to ease of the gas to help shift.(shifts fine if manually shifted) whats next? I am going to change the sensor tomorrow. Is that the next best step? Where is it located? Any advise and tips would be awesome! thanks
Yes, it is the next best step. But before you change it I recommend you get ahold of a scan tool that shows ECT to see if it is actually malfunctioning. No need to repost. This post should be merged with your original we were helping you with because you are trying to solve the same thing. There are quite a few posts on the board that point out how to change the sensor.

The coolant temp sensor is located on the drivers side of the engine block directly above where the thermostat housing is. You will need to drain the coolant to change it. The only way to drain the coolant is to remove the lower radiator hose. If your hose is old you may want to change it at that time. So be prepaired with the new parts and 50/50 premix Dexcool in case it is your only vehicle.
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Old 10-03-2011, 10:59 PM
envoy03kmv envoy03kmv is offline
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2003 GMC Envoy SLE
Graystone Metallic 4.2L I6 2WD
Join Date: Oct 2011
Location: Parsons KS
Posts: 13
will a scanner pick up/detect codes if no engine light is on. sorry to be doing things wrong very new to a computer let alone internet and this site. but i do appreciate all the advise
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Old 10-03-2011, 11:01 PM
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Ralph_T Ralph_T is offline
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2005 GMC Envoy SLE XL
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Originally Posted by envoy03kmv View Post
will a scanner pick up/detect codes if no engine light is on. sorry to be doing things wrong very new to a computer let alone internet and this site. but i do appreciate all the advise
Yes it will. They are called pending codes.

Your not doing things wrong. Your just not experienced with this type of work. I can appreciate that. At least your asking questions rather than just rushing into the job and coming back letting us know you broke something. There is a lot of info on this website. I suggest you use and get accustomed to the search function. It is your friend.
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