Finding my AC fan louder than usual

tester2011 · 08-30-2021, 04:23 PM

I have noticed today that my AC fan is very loud. Even when I am driving. Is that normal. Not sure if it just stated today or its from before. I tend to keep my music volume loud. When I lowered the volume I noticed the noise. AC seems to be functioning as it should.

Its 84 degrees Fahrenheit in Toronto today.

HighlandPete · 08-30-2021, 04:52 PM

Do you mean faster running, or simply louder at the same fan speeds?

tester2011 · 08-30-2021, 05:10 PM

Quote:

Originally Posted by HighlandPete

Do you mean faster running, or simply louder at the same fan speeds?

Louder at the same fan speed..I usually leave it in the middle

HighlandPete · 08-30-2021, 05:43 PM

Quote:

Originally Posted by tester2011

Louder at the same fan speed..I usually leave it in the middle

When you say in the middle, is that a manual setting, or in Auto with a mid intensity setting?

If in Auto mode, then it's most likely just a different 'loudness' as the fan is changing speed due to demand for cooling.

tester2011 · 08-30-2021, 05:56 PM

Quote:

Originally Posted by HighlandPete

When you say in the middle, is that a manual setting, or in Auto with a mid intensity setting?

If in Auto mode, then it's most likely just a different 'loudness' as the fan is changing speed due to demand for cooling.

Its left in Auto always...I usually manually adjust it to the middle...

tester2011 · 08-30-2021, 11:40 PM

I did another test on my way to home from work. I put the AC on "Max AC" and the noise just got louder. Taking it off Max AC mode the noise is still noticable..blower motor perhaps?

HighlandPete · 08-31-2021, 05:19 AM

Quote:

Originally Posted by tester2011

I did another test on my way to home from work. I put the AC on "Max AC" and the noise just got louder. Taking it off Max AC mode the noise is still noticable..blower motor perhaps?

Does it sound as if it's a motor bearing, something like debris in the fan, or just pushing lots of air?

tester2011 · 08-31-2021, 12:08 PM

Quote:

Originally Posted by HighlandPete

Does it sound as if it's a motor bearing, something like debris in the fan, or just pushing lots of air?

Sounds like motor bearing.

Psi5 · 08-31-2021, 04:01 PM

Quote:

Originally Posted by tester2011

Sounds like motor bearing.

Agreed on the bearing. If it were cycling on and off, louder and quieter, it might be the blower motor controller or thermostat, but if the fan is steady speed ad making the noise, likely the motor itself. If it is in your 2018, should be covered by the warranty.

Wires · 08-31-2021, 05:55 PM

It's possible something is wedged in the blower. All it takes is a chunk of leaf to throw it off balanced causing a lot of noise.

bryanbrian · 08-31-2021, 06:46 PM

my blower motor was making a loud vibrating noise. I took out the motor from under the dash and found all kinds of crap in the fan. problem solved.

tester2011 · 08-31-2021, 08:37 PM

Quote:

Originally Posted by Psi5

Agreed on the bearing. If it were cycling on and off, louder and quieter, it might be the blower motor controller or thermostat, but if the fan is steady speed ad making the noise, likely the motor itself. If it is in your 2018, should be covered by the warranty.

Yes it is in the 2018 (thats the only one I have)....I have a booked it in for next week. My car is due for the brake fluid flush as well. They will be providing me a loaner as they stated it takes about a day to diagnose the issue.

I also have been experiencing (clunk? not sure how to describe the noise) when reversing or in drive after the car moves there will be a loud noise from the transmission)..is it just me or is anyone else experiencing similar noise?

Elvisfan · 08-31-2021, 11:21 PM

Quote:

Originally Posted by Psi5

Agreed on the bearing. If it were cycling on and off, louder and quieter, it might be the blower motor controller or thermostat, but if the fan is steady speed ad making the noise, likely the motor itself. If it is in your 2018, should be covered by the warranty.

As stated, it may be something lodged. Like a leaf. My dealer said it’s probably a leaf. $175 to take it apart. Not covered under warranty.

tester2011 · 08-31-2021, 11:40 PM

Quote:

Originally Posted by Elvisfan

As stated, it may be something lodged. Like a leaf. My dealer said it’s probably a leaf. $175 to take it apart. Not covered under warranty.

Hopefully it is the motor itself and not a leaf stuck

bryanbrian · 09-01-2021, 02:25 PM

Its pretty darn easy to take out the fan motor. $175 means its less than a one hour job for dealer, so not much longer for an amateur.

tester2011 · 09-10-2021, 07:32 PM

The dealer replaced the blower motor. It was the motor itself that was defective.

08-30-2021, 04:23 PM	#1
tester2011 Private First Class 82 Rep 136 Posts Drives: 2020 M340i xDrive Join Date: Jan 2021 Location: Toronto iTrader: (0)	Finding my AC fan louder than usual I have noticed today that my AC fan is very loud. Even when I am driving. Is that normal. Not sure if it just stated today or its from before. I tend to keep my music volume loud. When I lowered the volume I noticed the noise. AC seems to be functioning as it should. Its 84 degrees Fahrenheit in Toronto today. Last edited by tester2011; 08-30-2021 at 04:45 PM..
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08-30-2021, 04:52 PM	#2
HighlandPete Lieutenant General 6659 Rep 15,858 Posts Drives: BMW F11 535i Touring Join Date: Mar 2007 Location: Scotland, Highland Region iTrader: (0)	Do you mean faster running, or simply louder at the same fan speeds?
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08-30-2021, 11:40 PM	#6
tester2011 Private First Class 82 Rep 136 Posts Drives: 2020 M340i xDrive Join Date: Jan 2021 Location: Toronto iTrader: (0)	I did another test on my way to home from work. I put the AC on "Max AC" and the noise just got louder. Taking it off Max AC mode the noise is still noticable..blower motor perhaps?
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08-31-2021, 05:55 PM	#10
Wires Brigadier General 1662 Rep 4,906 Posts Drives: 2016 340i xDrive Join Date: Apr 2008 Location: Calgary iTrader: (0)	It's possible something is wedged in the blower. All it takes is a chunk of leaf to throw it off balanced causing a lot of noise.
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08-31-2021, 06:46 PM	#11
bryanbrian Private 26 Rep 55 Posts Drives: 2012 328i Join Date: Apr 2018 Location: Toronto iTrader: (0)	my blower motor was making a loud vibrating noise. I took out the motor from under the dash and found all kinds of crap in the fan. problem solved.
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09-01-2021, 02:25 PM	#15
bryanbrian Private 26 Rep 55 Posts Drives: 2012 328i Join Date: Apr 2018 Location: Toronto iTrader: (0)	Its pretty darn easy to take out the fan motor. $175 means its less than a one hour job for dealer, so not much longer for an amateur.
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09-10-2021, 07:32 PM	#16
tester2011 Private First Class 82 Rep 136 Posts Drives: 2020 M340i xDrive Join Date: Jan 2021 Location: Toronto iTrader: (0)	The dealer replaced the blower motor. It was the motor itself that was defective.
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