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  1. #1

    Default Coolant Temperature Sensor

    I have a 2007 Silverado with a V6. I was on the way to work today and my temperature gauge quit working. I also got a dashboard message saying "Engine Hot A\C shutting down. The truck was running just fine. I left work at lunch and halfway to the auto parts store the guage started working and the code went away. I am thinking that the Coolant Temperature Sensor must be bad or going bad. I bought one and got home. I cannot find the sensor on the truck. I can't even find the thermostat. I was hoping somebody has a picture that shows the location of the sensor.

  2. #2
    Sr. Apprentice
    Join Date
    Nov 2009
    Grandview, WA


    1. Drain the cooling system to a level below the ECT sensor.
    2. On 6.6L diesel engines, remove the alternator.
    3. Unplug the harness connector from the ECT sensor.
    4. Remove the ECT sensor from the engine.
    5. Installation is the reverse of removal. If reusing the old sensor, coat the threads with GM sealant 12346004 or equivalent. New sensors are already coated; additional sealant is not needed. Tighten the sensor to 15 ft. lbs. (20 Nm).
      ECT sensor mounting—4.3L engines
      Click to Enlarge ECT sensor mounting—4.8L, 5.3L, 6.0L and 6.2L engines
      Click to Enlarge

  3. #3

    Default Next Step

    Thanks so much for the info. I replaced the sensor but it is still not fixed. Where is the thermostat located? I want to change that next.

  4. #4

    Question Wtf

    I have a 2008 GMC v6 with the same issue have you figured it out yet

  5. #5

    Default Fixed

    I changed the thermostat and it still did not work. I then decided to disconect the battery terminal. After that it worked. Maybe it just needed reset. I think if I had done that before the thermostat that would have fixed it. I still could not get the overflow tank to pull water. I was also concerned that mixing tap water witht the dex-cool would turn it to mud. I took it to the dealer and had them do a coolant flush. Now everything is working great. I hope that helps. I did replace the temp sensor first in case I left that info out.

  6. #6


    I'm experiencing the exact same thing with my '08 Silverado 4.3L V6...even the miraculous "fixing itself on its own" part. I had it scanned at Autozone and it gave a DTC of P0128. It seems to be leaning towards the ECT sensor, but I have read also that it can mean that the coolant temperature is below regulated levels.

    The two times this has happened it was cool enough out in the morning that I had the heat on for the trip to work. It has never happened when it was 90+ out and I had the A/C running.

    ~Insert ghostly theme song here~ Strange...but true
    2008 Chevrolet Silverado LT 4x4-Bone stock for now

  7. #7

    Default Thanks GM

    It started out that it would stop working- temp gauge goes to 0 and A/C shut down and then it would come back on its own, now it stays at 0 and A/C off with no particular trigger to make it happen , I just reset the computer and it is good for anywhere from an hour to usually a couple of weeks. I talked to a tech who said it is a common prob and that the computer needs to be updated. This sounds like a defect to me and should be a recall but with the way things are going for Gov Motors I dont see it happening , anyway I dont have the funds to take it in and pay hour(s) to have the computer dicked with so I just wanted to let you and any one else know what I found out. Easiest way to reset on the go that I have found- motor off key at off position pop hood and disconnect the main fuse box buy pulling up the handles and the lift it up just an inch for about 10 sec lock it back down .................
    Last edited by snorch; 03-05-2011 at 01:53 PM.

  8. #8



    I've changed out the ECT sensor ($33 at the dealership) and that didn't solve the problem.
    I changed out the thermostat and then used the method posted by snorch to clear everything out.

    Now...the wait begins to see if this did any good.

  9. #9
    murdog94's Avatar
    Join Date
    Feb 2008
    Cloquet, Minnesota, United States
    Blog Entries


    Keep us posted, and if you dont mind me asking why didnt you bring it in and make the dealer handle it? Im a fan of the dealer paying for things that go wrong under warranty.


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  10. #10


    Quote Originally Posted by murdog94 View Post
    Keep us posted, and if you dont mind me asking why didnt you bring it in and make the dealer handle it? Im a fan of the dealer paying for things that go wrong under warranty.
    In my case this problem started at just over 40,000 as of now I have 70,000 on this truck. I have no mods nor have I messed with anything so to have this going on really pisses me off.

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