AC Whirring Noise
08-11-2009, 06:41 PM
#1
Senior Members
Thread Starter
Join Date: Aug 2007
Location: USA
Posts: 584
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2005 545i E60 Orient Blau Metallic
Premium, NAV, Winter Package, Heads Up Display, Logic 7 Audio, AngeliBright Upgrade [White], M5 Body Kit, M Embroidered Seats
So I'm in my car at the light and I hear this high-low pitch alternating whining noise that is coming straight from the engine compartment. I turn the AC off to get a better feel for it and the sound goes away... Turn it back on, and there's the noise again
It's fairly imperceptible and you can't hear it on movement - the sound is definitely from the AC because of the relation with the controls. It's a humming type of noise, alternating high and low pitch (like a rotary washing machine may make).
Anyone heard of this before? Is it a belt or a fan or something????
It's fairly imperceptible and you can't hear it on movement - the sound is definitely from the AC because of the relation with the controls. It's a humming type of noise, alternating high and low pitch (like a rotary washing machine may make).
Anyone heard of this before? Is it a belt or a fan or something????
04-14-2010, 12:47 PM
#2
Members
Join Date: Jan 2009
Location: Hawaii
Posts: 75
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2006 BMW 550i CPO bought in Jan 2009
Old post, but I have a similar issue
I think I have a similar noise. It goes away when I turn off the AC (fan still on). I brought it to the attention of my SA, but they could not replicate so I still have it. I'm wondering if it might be a bearing issue on the AC compressor.
Does anyone else have this issue?
I think I have a similar noise. It goes away when I turn off the AC (fan still on). I brought it to the attention of my SA, but they could not replicate so I still have it. I'm wondering if it might be a bearing issue on the AC compressor.
Does anyone else have this issue?
04-17-2010, 04:15 AM
#3
Members
Join Date: May 2009
Location: Liverpool, UK
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: '05 525d
I have a similar noise. It's very intermittent, it pitches high and low, and it goes away with the AC turned off.
It actually comes from a black box under the bonnet (although it's very audible from inside the car), the noise seems to be it pumping water through a pipe which eventually goes to the EGR thermostat. It happens even with the engine off if the AC is turned on, which makes it easy to find the offending component. It is intermittent though, and I'm not sure exactly what brings it into action.
It actually comes from a black box under the bonnet (although it's very audible from inside the car), the noise seems to be it pumping water through a pipe which eventually goes to the EGR thermostat. It happens even with the engine off if the AC is turned on, which makes it easy to find the offending component. It is intermittent though, and I'm not sure exactly what brings it into action.
04-17-2010, 08:15 AM
#4
Contributors
Join Date: Aug 2008
Location: St Pete, FL
Posts: 252
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2011 550i M sport
So I'm in my car at the light and I hear this high-low pitch alternating whining noise that is coming straight from the engine compartment. I turn the AC off to get a better feel for it and the sound goes away... Turn it back on, and there's the noise again
It's fairly imperceptible and you can't hear it on movement - the sound is definitely from the AC because of the relation with the controls. It's a humming type of noise, alternating high and low pitch (like a rotary washing machine may make).
Anyone heard of this before? Is it a belt or a fan or something????
It's fairly imperceptible and you can't hear it on movement - the sound is definitely from the AC because of the relation with the controls. It's a humming type of noise, alternating high and low pitch (like a rotary washing machine may make).
Anyone heard of this before? Is it a belt or a fan or something????
Yes, mine does it as well. exactly as youve described. Not sure of there is a defect but definately common in these cars....crazy isnt it...my 15k maxima did not do this but my 69k bmw does!!
04-17-2010, 09:57 AM
#5
Members
Join Date: Jan 2009
Location: Hawaii
Posts: 75
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2006 BMW 550i CPO bought in Jan 2009
I have a similar noise. It's very intermittent, it pitches high and low, and it goes away with the AC turned off.
It actually comes from a black box under the bonnet (although it's very audible from inside the car), the noise seems to be it pumping water through a pipe which eventually goes to the EGR thermostat. It happens even with the engine off if the AC is turned on, which makes it easy to find the offending component. It is intermittent though, and I'm not sure exactly what brings it into action.
It actually comes from a black box under the bonnet (although it's very audible from inside the car), the noise seems to be it pumping water through a pipe which eventually goes to the EGR thermostat. It happens even with the engine off if the AC is turned on, which makes it easy to find the offending component. It is intermittent though, and I'm not sure exactly what brings it into action.
My POS mustang had less noises and rattles then my 550....but I still like the 550 better!
04-17-2010, 03:30 PM
#6
Members
Join Date: Jan 2009
Posts: 40
Likes: 0
Received 0 Likes
on
0 Posts
Hi,
It's probably the electric aux water pump. This is hung off the body with a rubber mount mid way down the right hand side of the engine bay. There is an improved mount available which cures, or at least reduces the noise. I jammed some foam between the rubber mount and the body which helped until my dealer changed the mount under warranty. noise is now gone.
It's probably the electric aux water pump. This is hung off the body with a rubber mount mid way down the right hand side of the engine bay. There is an improved mount available which cures, or at least reduces the noise. I jammed some foam between the rubber mount and the body which helped until my dealer changed the mount under warranty. noise is now gone.
04-18-2010, 02:25 AM
#7
Members
Join Date: May 2009
Location: Liverpool, UK
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: '05 525d
Hi,
It's probably the electric aux water pump. This is hung off the body with a rubber mount mid way down the right hand side of the engine bay. There is an improved mount available which cures, or at least reduces the noise. I jammed some foam between the rubber mount and the body which helped until my dealer changed the mount under warranty. noise is now gone.
It's probably the electric aux water pump. This is hung off the body with a rubber mount mid way down the right hand side of the engine bay. There is an improved mount available which cures, or at least reduces the noise. I jammed some foam between the rubber mount and the body which helped until my dealer changed the mount under warranty. noise is now gone.
05-25-2010, 01:04 PM
#8
Members
Join Date: Jun 2008
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Hi, I have similar noise I guess. Is your sound dependent to engine revs? I have annoying noise which goes completely away when AC turned off and the noise is dependent on engine speed. I'm expecting the sound coming from the compressor, but found this post and got interested.
Did you fix the problem and was the water pump. Is the pump on the left side of the car...found a pump over there. Sound is very annoying in slow speeds....while driving in a city with traffic lights and so on. This sound does not start immediately when engine started....after 2-5minutes the sound starts.
Car: E61 530da 2005
Did you fix the problem and was the water pump. Is the pump on the left side of the car...found a pump over there. Sound is very annoying in slow speeds....while driving in a city with traffic lights and so on. This sound does not start immediately when engine started....after 2-5minutes the sound starts.
Car: E61 530da 2005
Thread
Thread Starter
Forum
Replies
Last Post