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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
    Location
    Grandview, WA
    Posts
    68

    Default

    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

    Default

    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

    My problem was the thermostat housing was leaking from the factory , only slightly. The a/c shut off and the temp gauge went to zero and the information light gave the warning. The little bit of coolant that leaked out caused the problem and the computer shut the a/c down. I tightened the two bolts on the thermostat housing , added water and lifted the fuse box up , this reset everything and I haven't had a problem since , 3,000 miles later.

  8. #8

    Default

    so i do now know that i have a cracked head in there and cylinder one and four are missing 400-500 times per minute but i still do have some coolant issues and for some reason not to sure why but when the bottom of the truck gets wet the temp gauge goes threw the roof lol nobody can figure this one out

  9. #9

    Default

    Quote Originally Posted by footballmoose View Post
    My problem was the thermostat housing was leaking from the factory , only slightly. The a/c shut off and the temp gauge went to zero and the information light gave the warning. The little bit of coolant that leaked out caused the problem and the computer shut the a/c down. I tightened the two bolts on the thermostat housing , added water and lifted the fuse box up , this reset everything and I haven't had a problem since , 3,000 miles later.
    Checked my thermostat housing and it is good so I just changed my temp sensor if that does not work( I will know in a couple days) I will take it to the dealer and have the ECM updated/reflashed or what ever they do to it

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