Question about Chevrolet S 10

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The check gauges light comes on and the temp guage goes to 250. Then all the sudden the temp guage drops and the light goes off. What could be causing this as I have felt the hoses and they do not feel that hot

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  • sow_57 May 16, 2010

    If it is the coolant temp sensor where would this be located. Is it easy to replace

  • sow_57 May 16, 2010

    I really appreciate localwonder's help with this problem!!! Thank-you Thank-you

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  • Master
  • 6,784 Answers

Hi. Two areas of concern here. The first will be the actual coolant temp sensor. This deice is responsible for reporting the many fluctuations of temperature variances throughout a running engine. If this device fails, it will induce the symptoms your are experiencing. The second area of concern will be the connecting harness at the sensor. This harness may have a bad ground, or it may be faulty in a whole. A simple voltage test at the connector will confirm the damage to the wiring harness, if present.

Now, in order to properly post the actual location of this sensor, i will need your engine size and liter information, asap.

Thanks..

Posted on May 16, 2010

  • 5 more comments 
  • sow_57 May 16, 2010

    4.3 V6 Fuel injected

  • Michael Masters
    Michael Masters May 16, 2010

    Thank you. One moment please...

  • Michael Masters
    Michael Masters May 16, 2010

    Ok, Your sensor will be located on the top center, upper motor area. It will be on the passenger side of the coolant outlet hose mounted directly into the intake manifold.

  • Michael Masters
    Michael Masters May 16, 2010

    Its very easy to replace.

  • Michael Masters
    Michael Masters May 16, 2010

    Electronic Coolant Temp Sensor

  • Michael Masters
    Michael Masters May 16, 2010

    ECT

  • Michael Masters
    Michael Masters May 16, 2010

    1998-99 4.3L engines




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  • Master
  • 755 Answers

Bad coolant temp sensor

Posted on May 16, 2010

  • sow_57 May 16, 2010

    where is the coolant sensor?

  • john andrew manchook May 16, 2010

    The Coolant Temperature Sensor or ECT sensor for the gauge is in the drivers side cylinder head between the front two spark plugs. Use care and allow enough time for the engine to cool before removing the ETC sensor. You will need to refill the cooling system.
    Bellow a picture from a repair manual
    http://bit.ly/40yBqj

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