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Fan switch set for really high temp?

Discussion in 'Gen 3 Prius Main Forum' started by Frogerelli, Apr 15, 2019.

  1. Frogerelli

    Frogerelli Junior Member

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    2017 Prius
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    Four
    2010 Prius, 81k miles.

    When refilling the coolant after replacing my water pump today, I let the car run in maintenance mode for about 30 minutes (ambient air temp about 70F), waiting for the electric fans on the radiator to kick in. Even though coolant was flowing through the reservoir, the fans didn't turn on.

    Is that normal? After replacing the water pump, the amber check engine light on the dash turned off. I didn't even have to use the diagnostic reader to clear the code.
     
    #1 Frogerelli, Apr 15, 2019
    Last edited: Apr 15, 2019
  2. ChapmanF

    ChapmanF Senior Member

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    IV
    If you have an OBD reader, you can watch the coolant temp going up. I think the fans kick in around 95 C or so. It's a small engine and doesn't put out that much heat, so depending on the surrounding conditions, it can take about forever.
     
    #2 ChapmanF, Apr 15, 2019
    fuzzy1 likes this.
  3. fuzzy1

    fuzzy1 Senior Member

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    My experience with an OBDII monitor suggests a fan turn-on temperature of 203 or 205F, essentially the same as you think.
     
    #3 fuzzy1, Apr 15, 2019
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