Question about 2006 Pontiac Grand Prix

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06 grand prix --my temp gauge is not working, the needle is flatlined. when i start the car the needle swings to the top but then buries itself at the bottom of the gauge. On my dash i have digital read that shows the temp outside. the digital info is not relaying the temp outside like it usually does, it is 75 outside and the guage says 95 when i am stopped and if i go down the highway or something it will drop down over 10 or 20 degrees. so it is not registering the actual outside temp like it normally does. Coincidence or a related issue. Also i took my vehicle in for service today and got an oil change, about 2 hours later i noticed the gauge issue. What is going on? is it just electrical or a fuse? can i still drive with out consequence or am i going to overheat the vehicle. So is it just a coincidence that someone was under my hood today or did they mess up my vehicle. Any advice is appreciated. thanks

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  • Pontiac Master
  • 6,826 Answers

Coolant Temperature Sensor I would take the vehicle back to where it was serviced and try to ask them about what may have gone wrong to cause this problem.
The Intake Air Temperature sensor should also be checked.

The following is the procedure for servicing the coolant temperature sensor: Removal & Installation 3.8L Engine To Remove:

  1. Drain the coolant.
  2. Disconnect the engine coolant temperature (ECT) sensor connector. ECT sensor 3.8L 06 grand prix --my temp gauge is not working, the - gm-04-38-4321.gif

  3. Remove the ECT sensor.
To Install:
  1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
  2. Install the ECT sensor. Tighten 18 ft-lb (25 Nm).
  3. Connect the ECT sensor harness connector.
  4. Fill the cooling system.
5.3L Engine To Remove:
  1. Drain the coolant below the level of the engine coolant temperature (ECT) sensor.
  2. Disconnect the ECT sensor electrical connector. ECT sensor 5.3L gm-04-53-4322.gif

  3. Remove the ECT sensor from the cylinder head.
To Install:
  1. Clean the threads in the sensor mounting hole.
  2. Apply sealer P/N 13246004 or equivalent to the threads of the sensor.
  3. Install the sensor and tighten 15 ft-lb (20 Nm).
  4. Connect the ECT sensor electrical connector.
  5. Fill the cooling system and check for leaks.
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Posted on Sep 25, 2010

  • cwalter512 Sep 25, 2010

    so do u think it is safe to drive or will it overheat and crack my head or something

  • Duane Wong
    Duane Wong Sep 25, 2010

    I would check the temperature of the coolant with a thermometer and make sure it doesn't overflow in the overflow tank or boil over.

    If the engine doesn't malfunction, and the reading is just false, then the vehicle can be driven.

    But, I would not allow the problem to continue if it were my car, because I like to have accurate instrumentation.

    Take the car back to where it was last serviced and describe your problem. I would hope that they would support problems that arise after servicing your vehicle.

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