Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 11-11-2001, 03:47 PM
Registered User
Join Date: May 2001
Posts: 301
420SEL whirrling /humming sound

On the first start of the morning there is a low pitch whirling/humming sound comming (I think) from the passenger side of the engine compartment. It is easy to hear,it sounds as though it's speed is tied to rpms and it stops suddenly after a min. or so. Has anyone else had this occur?

Reply With Quote
Old 11-11-2001, 04:10 PM
jsmith's Avatar
Join Date: Aug 2001
Location: At Sea
Posts: 1,729
could it be the air pump? i think that's normal...
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
Reply With Quote
Old 11-11-2001, 05:44 PM
Registered User
Join Date: Jul 2000
Location: Toronto, CANADA
Posts: 1,193
It is the air pump, but the noise it not normal. If you can hear it than it is on its way to the junkyard. The air pump is part of the emissions control system and generally only operates the first little bit until the exhaust warms up. I had to replace the air pump on my 420SEL, and its not a cheap part. I bought a used one from an auto recycler for 1/2 the price and the an MB dealer installed it for me. Everything is working fine.
Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired
Reply With Quote
Old 11-11-2001, 07:25 PM
Dennis Taylor
Posts: n/a
I had my air pump rebuild a month ago in California for $80 including shipping.
Reply With Quote
Old 11-11-2001, 09:19 PM
Registered User
Join Date: May 2001
Posts: 301
Thank you gentlemen.

Dennis, please let me know who did the rebuild for you as I am also in CA

Also, where is this pump and is it belt driven?

Last edited by fredsegal; 11-11-2001 at 09:25 PM.
Reply With Quote
Old 11-11-2001, 10:31 PM
Dennis Taylor
Posts: n/a
The place was on the web or 1-800-745-1531. It was approx one week turn round.

The pump is low down below the alternator and has a electric clutch like the air conditioner. The overhaul did not include the clutch.

I have not re-installed it back on the car yet, but it was frozen solid at removal.

Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
No sound, driver side speakers, 420SEL William Car Audio and Multimedia 3 04-06-2004 04:05 AM
Sound Test for factory system ML Dude Car Audio and Multimedia 1 02-01-2004 01:24 PM
420SEL no sound on one side xsohaib Car Audio and Multimedia 2 03-17-2003 04:14 PM
Why do diesels sound different than gasoline engines. kerry Diesel Discussion 3 10-01-2002 12:31 AM
MP3 CD Sound Tailoring BenzOnline Off-Topic Discussion 3 09-18-2002 03:40 PM

All times are GMT -4. The time now is 09:48 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page