High Pitched Chirping Sound From Front With AC Running

nimonery · 08-26-2023, 05:57 PM

Hi everyone,

2020 330i. Has anyone experienced a high pitched chirping coming from the front vents while the AC fans are on? Happens intermittently but still very frequently and its driving me insane. I'm still under warranty and was finally able to get an appointment in with the dealer but of course while it was with them it decided not to do it.

The sound is loudest if you listen close under the passenger footwell. I've heard from people that possibly the flap for the air re circulation could be stuck if the cabin air filter was not properly installed before. It seems to speed up with increased fan speed but at max fans the fan noise drowns it out so it is most noticeable around mid-low fan speed.

I feel like this could be solved with a bit of silicon lubricant spray on the center of the blower fans... Does anyone know how accessible these are to get to?

Here is the video for reference

Thanks

GOTOFMS · 10-23-2023, 02:20 PM

I just had my blower motor replaced for the same issue. I believe its a bad bearing.

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nimonery · 10-23-2023, 04:39 PM

Quote:

Originally Posted by GOTOFMS

I just had my blower motor replaced for the same issue. I believe its a bad bearing.

Attachment 3306180

Glad you were able to get yours replaced. I ended up taking out the blower motor and giving it a nice coat of silicone lubricant all over the bearing/center and the squeak is gone - for now. I might regret not pushing harder to get a replacement under warranty if/when it comes back but oh well at least its not annoying me anymore.

msandonato23 · 02-17-2024, 06:23 PM

Quote:

Originally Posted by nimonery

Glad you were able to get yours replaced. I ended up taking out the blower motor and giving it a nice coat of silicone lubricant all over the bearing/center and the squeak is gone - for now. I might regret not pushing harder to get a replacement under warranty if/when it comes back but oh well at least its not annoying me anymore.

i am having this same issue with my 2021, and i was wondering how you went about removing the blower motor? did you have to take the glove box out, or am i missing something? there's so little info online about this for the g20, and i don't want to go breaking stuff... lol

08-26-2023, 05:57 PM	#1
nimonery Enlisted Member 29 Rep 43 Posts Drives: 2020 330i Join Date: May 2023 Location: CA iTrader: (0)	High Pitched Chirping Sound From Front With AC Running Hi everyone, 2020 330i. Has anyone experienced a high pitched chirping coming from the front vents while the AC fans are on? Happens intermittently but still very frequently and its driving me insane. I'm still under warranty and was finally able to get an appointment in with the dealer but of course while it was with them it decided not to do it. The sound is loudest if you listen close under the passenger footwell. I've heard from people that possibly the flap for the air re circulation could be stuck if the cabin air filter was not properly installed before. It seems to speed up with increased fan speed but at max fans the fan noise drowns it out so it is most noticeable around mid-low fan speed. I feel like this could be solved with a bit of silicon lubricant spray on the center of the blower fans... Does anyone know how accessible these are to get to? Here is the video for reference Thanks
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10-23-2023, 02:20 PM	#2
GOTOFMS Private First Class 81 Rep 131 Posts Drives: 2020 M340i Join Date: Jul 2022 Location: NY iTrader: (0)	I just had my blower motor replaced for the same issue. I believe its a bad bearing.
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