E90Post
 


N54Tuning.com
 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Whining sound when AC on (video attached) Possible AC Compressor Clutch going bad?



Reply
 
Thread Tools Search this Thread
      08-28-2017, 05:44 PM   #1
mayno
Captain
33
Rep
602
Posts

Drives: 2007 335i Sedan
Join Date: Dec 2006
Location: So Cal

iTrader: (0)

Whining sound when AC on (video attached) Possible AC Compressor Clutch going bad?

have about 135K miles...had my serpentine belt replaced around 65K. anyway, I hear a whirring/squealing when RPMs go above 2500 to 3000 RPMs. if i put the car in neutral and rev, the whirring sound is still present and gets louder, the higher the RPM gets. any ideas on what this may be? how many belts does the e90 have? just the s-belt? or others? thanks.


Edit: discovered the sound only happens when the AC is on so it's definitely not the serpentine belt. any ideas on what it is? the AC is still very cold and runs great.


Last edited by mayno; 09-01-2017 at 09:27 PM. Reason: added video
Appreciate 0
      08-29-2017, 11:20 AM   #2
mayno
Captain
33
Rep
602
Posts

Drives: 2007 335i Sedan
Join Date: Dec 2006
Location: So Cal

iTrader: (0)

bump
Appreciate 0
      08-29-2017, 03:19 PM   #3
BluesDriver
Private
3
Rep
77
Posts

Drives: 2011 328i Coupe
Join Date: Nov 2011
Location: Los Angeles

iTrader: (0)

That sounds like a bearing going bad. Take off the belt and see if any of the pulleys are making noise or feel very loose.
Appreciate 0
      08-31-2017, 01:14 AM   #4
mayno
Captain
33
Rep
602
Posts

Drives: 2007 335i Sedan
Join Date: Dec 2006
Location: So Cal

iTrader: (0)

so i isolated the sound. it only occurs when the AC is on. what could it be? the AC compressor, needs a recharge or something? the AC is still very cold. keep in mind, that i have had this car since 2007, and i leave the AC on "always" unless it's cold I use the heater, but that's like 2 months out of the entire year, i need the heater.

Last edited by mayno; 08-31-2017 at 01:15 AM. Reason: edit
Appreciate 0
      08-31-2017, 06:49 AM   #5
KentD
New Member
1
Rep
9
Posts

Drives: BMW E90 328i 2008 Sport Manual
Join Date: Aug 2017
Location: Ottawa

iTrader: (0)

AC clutch slipping on engagement? Bad A/c compressor bearing?
Appreciate 0
      09-01-2017, 07:16 PM   #6
mayno
Captain
33
Rep
602
Posts

Drives: 2007 335i Sedan
Join Date: Dec 2006
Location: So Cal

iTrader: (0)

i read on this forum that it could be the blower motor bearing... just don't know yet if that's the problem or if it's the AC compressor clutch.

it may be the AC compressor clutch since it gets louder with higher RPMs. the bearing in the Blower motor i don't think is RPM related.
Appreciate 0
      09-01-2017, 07:55 PM   #7
zooch7
Private
12
Rep
92
Posts

Drives: 08 335i
Join Date: Jun 2016
Location: Eugene, OR

iTrader: (0)

AC whine can also be a slow leak/ running out of charge
Appreciate 0
      09-01-2017, 09:26 PM   #8
mayno
Captain
33
Rep
602
Posts

Drives: 2007 335i Sedan
Join Date: Dec 2006
Location: So Cal

iTrader: (0)

but it's still very cold air. hard to associate a slow leak with the fact that it gets louder with the higher RPMs only.
Appreciate 0
      09-02-2017, 07:18 PM   #9
cybermgm23
Second Lieutenant
cybermgm23's Avatar
United_States
27
Rep
285
Posts

Drives: E90 328i, Jet Black
Join Date: May 2016
Location: San Francisco

iTrader: (0)

could be a defective belt tensioner. as the ac engages it puts more strain on the belt thus causing is to slip if the tensioner is bad.
Appreciate 0
      09-03-2017, 02:28 PM   #10
bobkat09
Enlisted Member
4
Rep
40
Posts

Drives: 2009 335 Coupe 6mt
Join Date: Nov 2013
Location: Cedarburg WI

iTrader: (0)

Quote:
Originally Posted by zooch7 View Post
AC whine can also be a slow leak/ running out of charge
+1. Had similar noise. A/C needed recharging
Appreciate 0
      09-04-2017, 08:08 PM   #11
siphor1989
Lieutenant
67
Rep
400
Posts

Drives: bmw 335i
Join Date: May 2015
Location: .

iTrader: (2)

Quote:
Originally Posted by zooch7 View Post
AC whine can also be a slow leak/ running out of charge
When my ac was low on charge, the whine could only be heard in the cabin. The noise the OP has seems to be mechanical like a bad compressor bearing or clutch.
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 05:16 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST