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Kona EV Loud intermittent rattling noise from under the hood.

Discussion in 'Hyundai Kona Electric' started by Ed., Oct 16, 2023.

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  1. Oct 16, 2023 #1
    Ed.

    Ed. New Member

    This afternoon, after a commercial charge, a loud rattle sound comes from the driver side of the engine compartment. The noise lasts for 17 seconds, followed by silence for 13 seconds, etc.
    The noise starts after I start the car, when it stands still.
    I'm not sure if the noise persists during driving due to road noises.
    I wanted to ask if anyone has had the same problem and if it is safe to drive back home.
     

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  2. Oct 16, 2023 #2
    electriceddy

    electriceddy Moderator Staff Member

    Nanaimo BC, 2021 Kona Ultimate Built Sept 2020
    This would be the first report of this nature. Did you open the hood and look around or try to locate exactly where it occurred?
    Maybe a coolant pump on the fritz, try to include a sound clip or video also include Model year.
    Also if error warnings displayed on dash;)
     
  3. Oct 16, 2023 #3
    Ed.

    Ed. New Member

    Thank you for your helpful reply, ElectricEddy !
    The noise appears to originate from the lower (deeper) part, of the engine compartment, left (driver) side of the electric motor.
    I recorded the noise but I couldn't attach it: .Wav file format not allowed ...
     
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  4. Oct 16, 2023 #4
    Ed.

    Ed. New Member

    Model Kona EV. 2019
    No indicators on dashboard.
    It could indeed be a coolant pump.
    If that's the case, can I drive it for 200 miles to my dealer ?
     
  5. Oct 17, 2023 #5
    KiwiME

    KiwiME Well-Known Member

    New Zealand '2019' EU, heat pump, pink coolant
    Sounds your HVAC compressor is on the fritz. Best see the dealer...
     
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  6. Oct 17, 2023 #6
    electriceddy

    electriceddy Moderator Staff Member

    Nanaimo BC, 2021 Kona Ultimate Built Sept 2020
    Here are pictures of the 2 pumps:
    [​IMG]
    [​IMG]
    One cools traction battery and the other electronics. Sounds like the left side (electronics-inverter, LVDC etc) might be the one in question (if indeed that is the issue) so it would be anybody's guess as to when the "rattle" will develop into a total failure.
    I would be cautious when you drive the vehicle to the service center and keep an eye out for any errors displayed. If the rattle continues all the way on your trip, that is not a bad thing, as it would indicate the unit is still operational and be easy to diagnose.
    Nice and slow...maybe?
     
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  7. Oct 17, 2023 #7
    electriceddy

    electriceddy Moderator Staff Member

    Nanaimo BC, 2021 Kona Ultimate Built Sept 2020
    Either way, I would have no issues making the 200 mile drive to the dealer to have it checked out, just keep an eye out for any display errors:)
     
  8. Oct 17, 2023 #8
    KiwiME

    KiwiME Well-Known Member

    New Zealand '2019' EU, heat pump, pink coolant
    Yeah, the circumstances seem to point more to a coolant pump.
     
  9. Oct 17, 2023 #9
    Ed.

    Ed. New Member

    Thanks a LOT for your very helpful feedback, ElectricDave and KiwiMe !!
    That makes a lot of sense.
    I'll mozy homeward and keep an eagle's eye on the dash.
    Wishing you a glorious day !
     

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  10. Oct 17, 2023 #10
    Ed.

    Ed. New Member

    10
     
  11. Oct 17, 2023 #11
    Ed.

    Ed. New Member

    P.S. If it's the electronics cooling pump, would driving without AC help ?
    Also, is it true that the Kona is designed to (partially) cool its main battery by taking in air from the front grill while driving ?
     
  12. Oct 18, 2023 #12
    Ed.

    Ed. New Member

     
  13. Oct 18, 2023 #13
    Ed.

    Ed. New Member

    Following up with a partial conclusion:
    I safely, but warmly, drove home without using the A/C and the noise did not return.
    It therefore looks like you were both right on !
     
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  14. Oct 18, 2023 #14
    hobbit

    hobbit Well-Known Member

    Bahstahn
    Sometimes my A/C compressor has made some funny rattly noises for a while and then sorted
    itself out, sometimes *while* fast-charging as the cooling system kicks in. It probably has
    something to do with the compressor self-adjusting to whatever the cooling load is.

    _H*
     
  15. Oct 18, 2023 #15
    Ed.

    Ed. New Member

    This is great to hear, Hobbit ! :D
    The noise started as soon as I started backing up after commercially fast-charging on a warm day (90s Fahrenheit) in the sun.
    It makes sense that the cooling goes in overdrive to compensate for (the heat generated by) the fast-charging (on a warm day).
    I'll turn on the A/C and check if the noise comes back.
    I hope the problem was temporary, as in your case.
     
  16. Oct 19, 2023 #16
    insightman

    insightman Well-Known Member Subscriber

    Ann Arbor
    Back in 1993, Word 6.0 would occassionally display this warning:

    upload_2023-10-19_1-52-36.png
     
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  17. Oct 19, 2023 #17
    Ed.

    Ed. New Member

    Words of wisdom.
     

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