Humming noise after being parked

gtmax500 · 11-11-2015, 07:23 AM

Not sure where I should have posted this since it doesn't fit in any of the other places but here goes.

I am the extremely happy owner of a new 2016 M235xi, my first BMW, and this morning I arrived at my destination a little early so I sat in my car for a little while. Everything was off and I was playing on my phone when I started hearing this humming noise coming from a couple places in the dash. It's hard to describe but it sounded like a servo motor or something. It seems like it was supposed to happen so I'm not worried but it would be nice to know what the noise is. Anyone have any idea?

On a side note, coming from my first car of a used '05 Chevy Colorado; I am having way too much fun in this car and don't know how I will ever go back to anything with less performance. It's also great to be part of an awesome community of enthusiasts like we have here.

Thanks everyone!

overcoil · 11-11-2015, 07:26 AM

I'm wondering if it's the HVAC system vent system closing down or a supplemental cooling flow for the turbo ?
But it's normal

shark715 · 11-14-2015, 06:22 AM

Probably coolant being pumped through the turbo to cool it down. Our X5 does it and so does our Mini Countryman.

It's a great idea in terms of increasing turbocharger life, but I do wonder what this means for long term battery life. It's not good to leave a partially discharged car battery sitting for long periods of time, and with the way this is done it means the battery pretty much never sits fully charged.

11-11-2015, 07:23 AM	#1
gtmax500 Private First Class 77 Rep 129 Posts Drives: 2016 MW M235xi Join Date: Sep 2015 Location: Annapolis, MD iTrader: (0) Garage List 2016 BMW M235xi [0.00]	Humming noise after being parked Not sure where I should have posted this since it doesn't fit in any of the other places but here goes. I am the extremely happy owner of a new 2016 M235xi, my first BMW, and this morning I arrived at my destination a little early so I sat in my car for a little while. Everything was off and I was playing on my phone when I started hearing this humming noise coming from a couple places in the dash. It's hard to describe but it sounded like a servo motor or something. It seems like it was supposed to happen so I'm not worried but it would be nice to know what the noise is. Anyone have any idea? On a side note, coming from my first car of a used '05 Chevy Colorado; I am having way too much fun in this car and don't know how I will ever go back to anything with less performance. It's also great to be part of an awesome community of enthusiasts like we have here. Thanks everyone!
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11-11-2015, 07:26 AM	#2
overcoil Major General 3081 Rep 5,580 Posts Drives: M235i 6spd Join Date: Dec 2013 Location: Mid-Atlantic iTrader: (0)	I'm wondering if it's the HVAC system vent system closing down or a supplemental cooling flow for the turbo ? But it's normal
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11-14-2015, 06:22 AM	#3
shark715 Captain 166 Rep 860 Posts Drives: '11 X5 50i, '16 M235xi vert Join Date: Nov 2011 Location: New Jersey iTrader: (0)	Probably coolant being pumped through the turbo to cool it down. Our X5 does it and so does our Mini Countryman. It's a great idea in terms of increasing turbocharger life, but I do wonder what this means for long term battery life. It's not good to leave a partially discharged car battery sitting for long periods of time, and with the way this is done it means the battery pretty much never sits fully charged.
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