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Over-reving sound on E320

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  #1  
Old 05-24-2004, 12:08 AM
Tex Pat's Avatar
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Join Date: Feb 2004
Location: United States
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Default Over-reving sound on E320
Sometimes at idle after start up, I hear something under the hood (maybe it is the AC compressor or some type of blower) which sounds like it is revving at 5000+ RPM. I checked the tach once to be sure it wasn't the engine and it was not. It doesn't happen often, seems like it is after initial start up. Any ideas of what I am hearing?
 
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  #2  
Old 08-09-2004, 01:12 AM
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Default RE: Over-reving sound on E320
maybe your auxillary fan is comming on?
 
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  #3  
Old 08-09-2004, 08:00 AM
Join Date: Dec 2003
Location: Georgia, USA
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Default RE: Over-reving sound on E320
The AIR pump?
 
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  #4  
Old 08-09-2004, 09:16 AM
sleepwalker's Avatar
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Default RE: Over-reving sound on E320
can also be the diverter flap on the intake manifold.
 
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