[E92Shant]

Hello everyone, I recently got a 2018 640i and I've noticed a weird sound after driving and shutting off the engine. It's like a high pitch buzzing sound coming from the grill area. The sound goes away when the engine bay cools off. But when it's warm from driving it makes a buzzing noise every 1-3 minutes. I've liked a YouTube video of the sound. Anyone else have this noise? Is it normal? Thanks.

https://youtube.com/shorts/X8YHQqOtq5M?feature=share

[chayden2005]

Does your car have active grill shutters? Might be related to them positioning or ??

[KennyFSU]

I believe the fans can still run after shutting off the engine to help it cool down.

[E92Shant]

Originally Posted by KennyFSU

I believe the fans can still run after shutting off the engine to help it cool down.

The fan isn't on in my case.

[S1nner]

I have had the same noise on my F10 N55. It wasn't constant thought. I couldn't figure out where it's coming from and based on what I found on forums it's somewhat normal. Never went to a dealer or shop. This might help - https://www.bimmerfest.com/threads/c...hut-off.27889/

[tracer bullet]

Water pump?

[G35POPPEDMYCHERRY]

Originally Posted by tracer bullet

Water pump?

LMFAO when in doubt water pump.

half kidding. it could very well be the water pump

[tracer bullet]

Originally Posted by G35POPPEDMYCHERRY

LMFAO when in doubt water pump.

half kidding. it could very well be the water pump

Just replaced mine last weekend. It whined and did so including for a few seconds after engine off and key out.

I'd have thought a 2018 wouldn't have the issues the cars from a decade ago did, but...

They aren't silent. It doesn't necessarily mean it's bad, I wans't trying to imply that. Maybe it was always there and is mnormal and is simply being noticed?

[E92Shant]

Originally Posted by S1nner

I have had the same noise on my F10 N55. It wasn't constant thought. I couldn't figure out where it's coming from and based on what I found on forums it's somewhat normal. Never went to a dealer or shop. This might help - https://www.bimmerfest.com/threads/c...hut-off.27889/

I just brought the car back from the dealer, the tech said he couldn't replicate the issue. I'm going to take some notes on when exactly it happens and I'm going to take it back. I'll let you know.

[E92Shant]

Originally Posted by tracer bullet

Just replaced mine last weekend. It whined and did so including for a few seconds after engine off and key out.

I'd have thought a 2018 wouldn't have the issues the cars from a decade ago did, but...

They aren't silent. It doesn't necessarily mean it's bad, I wans't trying to imply that. Maybe it was always there and is mnormal and is simply being noticed?

I don't think it's the water pump because I remember how it sounds when I was bleeding the system from replacing the one on my 335.

[tracer bullet]

Originally Posted by E92Shant

I don't think it's the water pump because I remember how it sounds when I was bleeding the system from replacing the one on my 335.

You're probably right then if you're familiar with the sound. If you want to check to be sure, you could do the bleed process on this car too. Take the key out to stop it early, don't have to do the whole cycle.

[kring]

My car makes a ton of strange noises when I unlock or lock or turn on/off… no idea what’s going on… it’s like a spacecraft. I here things whirling, pressurizing, churning, whining, muffled buzzing, a zut-zat noise, some thing odd happens in the rear wheel well, a few things in the engine…

It’s been that way since day one - always makes me laugh, I don’t want to know what it is at this point because I might be disappointed it’s not the flux capacitor powering up, or the duel-posi-clutches engaging or the bi-turbo’s pre-charging…. Plus I don’t mind being asked what my car is doing and I reply, no idea! Or when people run up to me to tell me I left my car running.

[JoeyDDD0919]

May off the topic but my Jeep Grand Cherokee makes this noise after engine off as well...

But I'm trading it in this week so I don't care!

[G30M]

Originally Posted by kring

My car makes a ton of strange noises when I unlock or lock or turn on/off… no idea what’s going on… it’s like a spacecraft. I here things whirling, pressurizing, churning, whining, muffled buzzing, a zut-zat noise, some thing odd happens in the rear wheel well, a few things in the engine…

It’s been that way since day one - always makes me laugh, I don’t want to know what it is at this point because I might be disappointed it’s not the flux capacitor powering up, or the duel-posi-clutches engaging or the bi-turbo’s pre-charging…. Plus I don’t mind being asked what my car is doing and I reply, no idea! Or when people run up to me to tell me I left my car running.

same.

probably forgot to pay my subs somewhere along the line ...