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A very loud problem--Fan??

Old Jun 2, 2006 | 07:41 PM
  #1  
AMGBOY1's Avatar
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From: Ft Lauderdale
CLS55AMG-MKB, R500
A very loud problem--Fan??

Hey guys, when I start my R500 something under the hood(fan i think) becomes very loud(like a propeller plane taking off). This noise is very loud but goes away if i turn off the air(South Florida+summer=AIR CONDITIONING!! Is there anything i can do to fix it or should I take it to the MB dealer?

Last edited by AMGBOY1; Jun 2, 2006 at 08:09 PM.
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Old Jun 4, 2006 | 08:45 PM
  #2  
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air pump

Are you sure its not the air pump, the air pump will be activated when the engine is started to warm up the cat.
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Old Jun 4, 2006 | 09:01 PM
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From: Philadelphia area
2010 ML550, 2010 E350 4M, 1966 Corvette Convt C2
Believe its normal with the A/C on in very hot weather. My ML500 and my E class does it also. Can't hear it though inside with the windows closed.
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Old Jun 5, 2006 | 06:38 PM
  #4  
AMGBOY1's Avatar
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From: Ft Lauderdale
CLS55AMG-MKB, R500
I have two 2-car garages on either side of house and i can hear it from my library on the other side of the house which is not a short walk
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Old Jun 5, 2006 | 06:42 PM
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2010 ML550, 2010 E350 4M, 1966 Corvette Convt C2
Thats normal with the aux fan on. Mine in both of my MB's are quite loud. In cooler weather when it does not come om its much quieter.
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Old Jun 7, 2006 | 10:08 AM
  #6  
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03 E500 and Corvette
Originally Posted by sosh
Thats normal with the aux fan on. Mine in both of my MB's are quite loud. In cooler weather when it does not come on its much quieter.
Mine sounds like full engine run up on a aircraft just prior to take off. Can't hear it much inside though. But outside

Jim
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Old Jun 17, 2006 | 05:08 PM
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From: Northern Kentucky
2011 E350 4 Matic,1994 C220,1965 Mustang, 2005 Kawasaki Vulcan 1600
Very normal, MB wants as much air as possible passing over the a/c condensor at idle so that the a/c does not lose its cooling ability. As you pick up speed in the car the fan will slow down. I agree though, on my '06 E when outside of the car it sounds like a jet engine.
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Old Jun 21, 2006 | 05:49 PM
  #8  
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From: Lake Worth, FL
2006 C280
The cooling fan in my '06 C280 sounds more like a jet turbine. I agree that this is probably normal. I once had a VW Passat that did the same thing as does my wife's Volvo. I think it's a European thing.
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