P0128 Coolant temp below Thermostat Regulating Temp

[GregP]

Hello- I recently replaced the thermostat after I received the P0128 code. The code went away but came back after one month. I was told that it could be the Coolant temp Sensor. Can someone tell me where is the coolant temp sensor located. Is there a video related to this issue? All help very much appreciated.

 

[Sparky]

On the 2003 it is right next to the thermostat.

What does your temp gauge read at?

 

[gmcman]

I did this to an old 18MM socket with a dremel....works perfect.


coolant temperature sensor - Vortec 4.2L I-6 - GMTNation
http://gmtnation.com/forums/topic/11737-coolant-temperature-sensor/#entry304579

 

[webdawg]

If you are going to change the sensor, you really should make that socket.

 

[Sparky]

When I changed my sensor I wished I had that socket.

 

[webdawg]

I did the job and the directions I followed were early versions and they did not say anything about the socket.

I had such a hard time.