Prius intermittent temp light when driving uphill

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Vinny85, Sep 1, 2025 at 2:00 AM.

  1. Vinny85

    Vinny85 New Member

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    Hi everyone i have a 2011 prius that has about 250k miles on it. I have had the car for about 10 years no major issues. I replaced the water pump, thermostat, had the headgasket changed as a preventive maintenance once i got to 240k as i want to keep the car for awhile

    I notice the the car makes noise like there is air trapped in the coolant system. I can recreate the sound when i brake hard. I have monitored the temp levels and they stay around 192-196 hwy temps and uphill if i floor it i can get the temps to 206+ as it climbs

    Is this normal or should i be worried about the air noise in the coolant and the overheating light on long uphill drives?
     
    #1 Vinny85, Sep 1, 2025 at 2:00 AM
  2. bisco

    bisco cookie crumbler

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    i'm no expert, but i would be worried. idk what temp sets the light, but it can't be a good thing
     
    #2 bisco, Sep 1, 2025 at 2:20 PM
  3. Brian1954

    Brian1954 Senior Member

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    Did you install a Toyota OEM water pump or an aftermarket pump?
     
    #3 Brian1954, Sep 1, 2025 at 3:42 PM
  4. Gokhan

    Gokhan Senior Member

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    Certainly not normal with the noise and coolant running too hot.
     
    #4 Gokhan, Sep 1, 2025 at 4:03 PM
    Brian1954 likes this.
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