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Old 05-02-2009, 10:39 PM
Registered User
Join Date: Jul 2007
Posts: 517
High pitched screeeeeee sound from passenger glove box

Hi folks,

I own a 87 300DT Sedan. Over the past week or so when I start up the car, there is a high pitched screeching noise coming from around the passenger side glove box. After a minute or two, it stops. I am assuming for now it is vacuum related. More ominously after work, I started up my car and got on the freeway. It did not shift into 4th, so I pulled over and adjusted the trans cable nut (aka bowden cable nut) to shift earlier. It worked...gotta love these mechanically adjustable features! But I am thinking that it might be related to this noise and whatever the underlying cause is. I'm going to check the trans fluid now, but has anyone experienced the same sound? And if yes, what was the reason and what was the fix?

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Old 05-02-2009, 10:48 PM
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Join Date: Jan 2002
Posts: 18,355
Not sure what year it first began but some MB's have a small motor to suck in air to the climate control system. That motor is behind the glove box I think and sometimes makes a noise.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
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Old 05-03-2009, 12:15 AM
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Join Date: Dec 2005
Location: Ashland, MA
Posts: 2,602
Originally Posted by kerry View Post
Not sure what year it first began but some MB's have a small motor to suck in air to the climate control system. That motor is behind the glove box I think and sometimes makes a noise.
That's probably what it is. You can access it by pulling the glove box. I lubed mine with a drop of ATF per GSXR's recommendation. That has worked so far. Mine was worse when it was cold.
1987 300TD 309, xxx 2.8.2014 10,000 mile OCI

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Old 05-03-2009, 01:14 AM
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Join Date: Aug 2007
Location: B.C. Canada
Posts: 54
It is called the aspirator fan and it runs continously to suck a sample of air via a tube across a temp sensor located by the roof mirror.
I installed a new one; not expensive as I recall, from an on line jobber.
My Independant mechanic told me it would get worse and worse until it drove my crazy.
Lubing it might do just fine.
Retired Marine Engineer
2005 E320 CDI
1987 300 Turbo Diesel @ 300,000 kM going
1974 240 D 300,K Miles when given away gone
1970 200 D gone
1969 190 D gone
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Old 05-03-2009, 04:00 AM
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Join Date: Jul 2007
Posts: 517

Many thank you's to you all. I'll have to make some time to pull the glove box and lube the part. I'll do my part and post pics along the way.

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Old 05-03-2009, 01:43 PM
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Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
Blower cleaning and link to DIY

If lubing the blower doesn't make your noise go away, it's fairly easy to take the blower apart for a complete cleaning. I found mine to be rather dirty. It seemed to do a better job of pulling air after cleaning out the dust and lubricating the bushings.

Early versions of the W124 attached the little fan to the under-dash panel on the passenger side. The panel acts as a drumhead and amplifies the sound that the little blower makes. Later W124s attached the blower to the heavy-gauge tubing cross-brace that runs across the cabin behind the dash. In this position, the blower can no longer be heard. A DIY with pictures is posted on this forum here. The bracket could be fabricated with a piece of strap or search the junkyards for a later-than-1987 model.


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Old 05-04-2009, 12:57 PM
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as always, thank you for your help.

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