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high temperature warning light on

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by ePRIU$, May 18, 2021.

  1. ePRIU$

    ePRIU$ Junior Member

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    III
    It happens again today after several months it first occurred while I was driving on freeway, the high temperature warning red light came on for about 1 minute or less then it disappeared. I checked the coolant level, it stays Full as usual. Is this something I need to be aware of the thermostat or water pump issue? thanks.
     
    #1 ePRIU$, May 18, 2021
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  2. Mendel Leisk

    Mendel Leisk Senior Member

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    How many miles? If around 150k would be worthwhile to change water pump and thermostat.

    Had it since new? Possible a stop leak product’s been used?
     
    #2 Mendel Leisk, May 18, 2021
  3. Grit

    Grit Senior Member

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    if it happened again, you should update the existing thread instead of creating a new one. Or we will throw the standard suggestions of what to troubleshoot next.
     
    #3 Grit, May 18, 2021
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  4. ChapmanF

    ChapmanF Senior Member

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    Without a scan tool it's kind of difficult even to know which of the two temperature sensors for the engine or the several for the motor/generators and electronics has the high reading, or how high the reading is.
     
    #4 ChapmanF, May 18, 2021
  5. johnHRP

    johnHRP Active Member

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    Did you fix it? Sometimes prius water pump failed internally and cause bad overheating
     
    #5 johnHRP, Nov 21, 2021
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