I get a buzzing noise from where air gets sucked in for the climate control. Been more common lately... Any ideas guys? I thinking the motor that sucks the air needs replacing.


'97 E300

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#dieselFLEET
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'97 E300
'99 E300

michakaveli,

I get a noise that fits the description you gave, and traced it to the enclosure panels under the engine. The noise would start when I got near 60 or so mph, especially in a cross wind. It sounded exactly like it was coming from those vents in the hood.

I read somewhere in a post on this site that the vents themselves have undergone a design modification to address noises. I mentioned this to the service guys at the local dealership and they did not seem to know anything about such a design change. But they did fix the noise by re-fastening the panel under the engine. Hope this helps, Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

I'm sorry I was a little vague in my description. I am refering to where the air gets drawn from inside the cabin to monitor the correct temperature. Right in the front overhead lamp cluster, trough the little hole...

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#dieselFLEET
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'97 E300
'99 E300

You will need a asporator motor/blower soon. I have been replacing a whole bunch of those lately.
It's a little fan in your overhead control panel that draws in
air samples for the acc system to measure temp.
pn# 140 830 00 08 price $89.15
You just drop down the dome lamp panel and this unit is
removed from behind.
Good luck.
DR.D

Thanks Dr. Dies :-)


How do I remove that panel? Just try to gently pull it down. Is it just snapped in there with a few clips?

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#dieselFLEET
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'97 E300
'99 E300

Just pop off the 2 clear lenses for the dome lamp bulbs.
on the rear edge (closest to sunroof) there are 2 small notches
with metal retaining clips. pry these 2 tangs back at the same time and pull the rear edge down too.
the panel just clips and pops in. don't force it however,
the metal ring in the headliner will rip out and you will
feel rather silly.
the rest is self explanitory.

I took it apart this afternoon. It was really easy so I had no problems. I saw that the fan blade was covered with dust so I blew it out nicely with my air compressor. Sounds quiet now but I bet I'll need to replace it after a while anyway. Was that part number from Parts Bin or Benz dealer?

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#dieselFLEET
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'97 E300
'99 E300

MB Dealer number.

Dr. Diesel...

Do you or anyone know what wears ou tin these little motor assemblies? I already bought a new part and installed it and just torre apart the old one, and the motor is a brushless system? What tires these pieces out?


I'm curious to learn how these things work...

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#dieselFLEET
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'97 E300
'99 E300

Howdy,
I belive the bushing wears down allowing the fan blade to begin
to rub against the housing. From what I have seen, it is a fairly
cheezy little motor.
I have had these be noisy in new cars as well as cars with
heavy smoke from owners. (cigar)
I guess it depends on how much magic German plastic they use
when putting these little suckers together.
I hope yours lasts several more years.
DR.D

I have tha same car and had the same noise, I fixed by oiling the fan motor. The motor fan is located under the wiper blade assambly, is not that hard to remove but, if you need instruccions I will be glad to send it to you.

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1987 300D 208,000 miles
2004 Nissan Quest 28700
1999 E300TD 103,000

We are talking about the aspirator fan in the overhead control
panel. The last time someone I know oiled one up, the temp
resistor failed 10 minutes later.

Hi Guys,

Sorry to drag up an old thread but you guessed it, ... I have a similar problem with a 1998 C200 Classic.

I traced the buzzing to the overhead light panel and removed the large plastic plug in the centre. I put a finger up there and felt some vibration that was making a noise with the cable harness resting on top of the internal parts. Moving the harness a little got rid of the worst noise, but a low-level vibration drone remains.

I figure I can fix this but my problem now is getting the unit out of the roof. There are two slots on either side that I thought might house 'tangs' or similar but I haven't found a way to release the unit yet.

That baby is firmly up there and I don't want to use any force that would cause damage. Any help about removal of the overhead light panel would be much appreciated.