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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-09-2010, 10:36 PM
ArcspacE ArcspacE is offline
Freude am Fahren
Location: RSA
 
Join Date: Mar 2010
Posts: 89
Mein Auto: F30 320i
Question Air-Con Compressor Rattle?

Hello Friends,

Recently I started hearing a somewhat strange rattle-like noise from the what sounds like the air-con compressor in the front. It's only present while the system is on and when the car is in gear/drive. Goes away in neutral and it appears to be related to engine speed. Sounds similar to a plastic card flapping against the spikes of a bicycle. Air-con works just fine. And of course, if I switch the systen off - sound diappears.

My guess - pulley bearing/clutch?

Any advice would be much appreciated. Thanks in advance.
Arc

Last edited by ArcspacE; 03-10-2010 at 03:51 AM.
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  #2  
Old 03-10-2010, 04:02 PM
azazel61 azazel61 is offline
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Location: Australia
 
Join Date: Dec 2009
Posts: 34
Mein Auto: BMW 325CI 2001
I have a similar noise when my air con / fan is on - except mine sounds more like a bird chirping. Also seems to be dependent on engine speed.
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  #3  
Old 03-10-2010, 04:48 PM
LX-biker LX-biker is offline
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Location: Ontario, Canada
 
Join Date: Mar 2008
Posts: 611
Mein Auto: 2004 325XI Sport pkg
Have same noise. Turn A/C off during winter but soon need to find out how to fix. Dealership didn't notice anything but offer change belts. I change belts and pulleys and noise still there when A/C on. What mileage on the your car? mine 115k km.
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  #4  
Old 03-10-2010, 10:10 PM
ArcspacE ArcspacE is offline
Freude am Fahren
Location: RSA
 
Join Date: Mar 2010
Posts: 89
Mein Auto: F30 320i
Hey fellas,

Thanks for the input. The noise comes and goes randomly. Also have noticed - it appears more prominent/present at the lowest fan speed/coldest temp setting.
As far as the bird-like chirping - I've noticed a similar noise once or twice, again at low fan speeds. Microfilter?
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  #5  
Old 03-12-2010, 06:20 PM
LX-biker LX-biker is offline
Officially Welcomed to the 'Fest
Location: Ontario, Canada
 
Join Date: Mar 2008
Posts: 611
Mein Auto: 2004 325XI Sport pkg
No way, Microfilter? Yo mean cabin filter or filter inside metal can which is near passenger side headlight? Cabin filter is 2 month new in mine car and did not make a difference about noise.
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  #6  
Old 03-14-2010, 12:04 PM
ArcspacE ArcspacE is offline
Freude am Fahren
Location: RSA
 
Join Date: Mar 2010
Posts: 89
Mein Auto: F30 320i
Could be, mate.
The sound reduces is prominence as I adjust the temperature from cold to warm from the rotary dail between the air vents, i.e. noise goes away.
Really confused.
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