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Discussion Starter · #1 ·
Just got my car out of the shop for a recall and have noticed a somewhat loud humming noise from the back side of the motor after shut down. It's never done this before (or nowhere near this loudly) but now does it every time, anyone else notice their water pump running several minutes longer?
 

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I don't know about the water pump but the fan will stay on if i turn the car off when it's real hot. If I drive it very easy for the last mile coming home or let it sit for a minute or 2 before I shut it off, it doesn't run the fan after I shut the car down.
 

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Discussion Starter · #3 · (Edited)
Yeah I'm used to the fan running but this isn't that. Come to think of it I haven't heard the fans run at all since the update. I'll check that today, if they're not running maybe the coolant is running hot and that's what's prompting the pump to run.

I always drive easy the last few miles and its winter so I don't see how fluid temps should be causing this. Just odd that I've never heard it before and immediately after the dealership visit it's very noticeable and happens every time.

Short vid
https://youtu.be/xHZ_uOc7fEc
 

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I bet it's to cool off the turbo. Should only happen 30 to 60 seconds after shut-off. Not a bad thing IF that's what it is.

Best regards,

-Mike
 

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How long does it overrun, seconds, minutes?

There are several normal sounds that you will hear on today's electronically controlled automotive systems. Fuel pump, fuel canister purge, fan, AC/Heater motor, etc. I suspect it's one of these systems.

Personally, I believe it's the electric coolant pump to cool the turbo after shut down, circulating coolant while static cools the bearing cassette to help prevent damage and oil burning (remember no oil circulates while the engine is off but the turbo still spins.) Hyundai has been using this system since they went to the turbocharged gas engines. This is why it's no longer necessary to idle turbocharged cars, after you finish driving to let the car cool down.
 

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Discussion Starter · #6 ·
I would be happy with the car continuing to cool the turbo after shutdown, just trying to confirm this change was intended and I can just accept it's a new noise the car makes. That, or if this pump has always run like this I need to figure out why it is suddenly so loud. It runs 2-3 minutes.
 

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Someone correct me if I'm wrong but the water pump isn't electric, it's run by a pulley so when the engine's off, it has to be off. That's not the water pump.

It's also not the fan noise I hear sometimes.
 

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You're correct but there are two seperate water pumps. You have a mechanical for the engine and an Auxiliary Electric Water Pump (EWP Part #36900) pump for the turbo.

Seriously, you need to be more familiar with Hyundai's turbo system and the VN in general. The turbo chargers in every Hyundai including the VN, manufactured since the early 2015 and beyond are both oil and water cooled. If you'd like, I can post an actual photo of the EWP on the VN.:wink: However this should suffice.
 

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Just got my car out of the shop for a recall and have noticed a somewhat loud humming noise from the back side of the motor after shut down. It's never done this before (or nowhere near this loudly) but now does it every time, anyone else notice their water pump running several minutes longer?

I near the noise you're describing every time I shut off my 2020 and always have. Lasts maybe a minute to 2.
 

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Discussion Starter · #11 · (Edited)
I guess it's possible this is a change they made months ago and this just happened to be my first visit to the dealership where they could update it. The 2020's probably already have the update. My speculation is that it used to only run if some temperature sensor was above a certain threshold, now perhaps that threshold is lower.
 
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