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Over-reving sound on E320

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Old May 24, 2004 | 12:08 AM
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Tex Pat's Avatar
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Joined: Feb 2004
Posts: 17
From: United States
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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Old Aug 9, 2004 | 01:12 AM
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cmscott16's Avatar
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Joined: Dec 2003
Posts: 111
From: Seattle, USA
Default RE: Over-reving sound on E320
maybe your auxillary fan is comming on?
 
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Old Aug 9, 2004 | 08:00 AM
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Lugnut's Avatar
Joined: Dec 2003
Posts: 3,766
From: Georgia, USA
Default RE: Over-reving sound on E320
The AIR pump?
 
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Old Aug 9, 2004 | 09:16 AM
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sleepwalker's Avatar
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Joined: Apr 2004
Posts: 7,050
From: Philippine Islands
Default RE: Over-reving sound on E320
can also be the diverter flap on the intake manifold.
 
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