12-16-2023, 02:21 PM | #1 |
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High pitched whine noise cold start
Here’s a video of another guy who has the same issue: https://www.reddit.com/r/BMW/s/HXXCVXzEe7
I started my car this morning and heard that whine and was wondering what it was and most importantly, if it’s normal. Seems to only happen on cold start, but I don’t really remember it happening before.
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12-16-2023, 03:13 PM | #2 |
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I'm assuming you are not talking about the starter motor crank.
It is very common for M engines, new or old, to make this noise especially when it is cold outside. I suspect it's a combination of increased vibration from the reinforced engine mounts and chassis, and louder injectors and secondary air pump due to the colder weather.
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12-16-2023, 03:54 PM | #3 | |
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12-16-2023, 09:50 PM | #5 |
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12-16-2023, 09:54 PM | #6 |
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Same. Nothing to worry about. Belts turning and turbos winding.
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12-16-2023, 10:04 PM | #7 |
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Asked a friend, he says it could be due to our ACs starting up as soon as we turn the car on? Either way I don't think it's a big issue
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12-17-2023, 09:08 AM | #8 | |
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Sounds like normal accessory drive noise. But if the A/C is on the additional load the compressor places on the accessory drive could make the noise worse. |
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12-21-2023, 06:40 AM | #9 |
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Same here, every cold start after letting the car sit overnight and it makes this noise. As long as everyone else has it I'm not worried lol
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12-21-2023, 06:41 AM | #10 |
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The AC doesn't turn on when you unlock the car/turn on the ignition, it does it upon starting the engine automatically. Is there an option in iDrive to turn this off?
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12-21-2023, 08:09 AM | #11 | |
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But I don't leave the A/C compressor on. My SOP is to a few minutes before reaching my final destination of the day I use the climate control button to call up the climate control screen and slide the A/C compressor to OFF. Upon the next use of the car I start the engine and if A/C is needed turn on the A/C compressor via the same climate control button/screen. |
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12-21-2023, 12:12 PM | #12 | |
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12-21-2023, 12:23 PM | #13 | |
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Get in the car, push the start button three times without stepping on the clutch or brake pedal. Your fan will start. Assess noise. Enter the climate menu and turn off the climate functions. Your fan should stop. Turn on the car. Assess noise. |
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12-21-2023, 12:35 PM | #14 |
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Is the “turn off climate functions” option the key to making the car not turn on the AC automatically? I’m leaving in about an hour so I’ll report back if I hear the noise with this option checked.
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12-21-2023, 12:37 PM | #15 | |
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If you want the fan to continue, I believe there’s an option to turn off just the AC and keep the fan on. |
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12-21-2023, 12:40 PM | #16 | |
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And no, I don’t want the fan on, I want the whole system to not turn on automatically upon start up and would prefer for it to turn on when I actually want it to lmao
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12-21-2023, 12:41 PM | #17 | |
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I was describing steps to turn it off so you can assess the noise in different circumstances to determine where your noise comes from. |
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12-21-2023, 12:48 PM | #18 | |
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I’m just wondering why it starts the fan automatically in the G chassis, this didn’t happen on the F chassis
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12-21-2023, 01:03 PM | #19 |
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BMW automated everything in this car. Headlights, climate, heated seats. It’s annoying but it is what it is…
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12-22-2023, 12:40 AM | #20 |
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I forgot to click the turn off climate functions button when I started the car so I'll try again tomorrow
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12-22-2023, 05:33 AM | #21 |
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Kind of bummed you can't turn off the lights while the car is in motion. Not that I'd need to but I just think going "ghost" looks kind of cool when recording a roller lol
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12-22-2023, 06:59 AM | #22 |
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