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HV cooling fan question

Discussion in 'Gen 2 Prius Technical Discussion' started by robert Kwasny, May 7, 2021.

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  1. Frankusa94

    Frankusa94 New Member

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    Thanks for the thoughts on flashing the ecu. I haven't consulted toyota, trying first to fix on my own.
    Fan runs fine when controlled by 3rd party app called hybrid assistant. I am thinking of wiring a switched 12v directly to the fan. The fan will run a lot more...but It will keep the hv battery temp in the safe range. This is just until I find out why the cars ecu/componet is not managing the fan.

    Thanks for your input!

    Frank
     
    #21 Frankusa94, Aug 3, 2024 at 2:48 PM
  2. TMR-JWAP

    TMR-JWAP Senior Member

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    The controller for the fan is in the plastic duct on the passenger side of the HV battery. Held to the duct by rivets. It's identical to the one used in the car HVAC system.
     
    #22 TMR-JWAP, Aug 3, 2024 at 3:33 PM
  3. ChapmanF

    ChapmanF Senior Member

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    That box in the duct is the same thing that is responsible for the fan when Frankusa94 is using Hybrid Assistant to control it. The only difference is in what speed signal is being sent to it from the ECU.

    The crux of the matter seems to be that when not using Hybrid Assistant to override the fan speed signal, Frankusa94 disapproves of the ECU's choice of fan speed.
     
    #23 ChapmanF, Aug 3, 2024 at 4:12 PM
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