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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-08-2012, 10:42 AM
qsprn
 
Join Date: Apr 2008
Location: WI
Posts: 54
Cool Noise in trunk above left rear wheel well 84 300SD

About 5 minutes after starting and sitting at a stop light, there was a very loud high pitched whine coming from the the rear. It almost sounded like screaming power steering but clearly from the trunk. It lasted about 15 seconds and quit. It did it another 6-8 times while both driving and idling but got progressively better. I have not heard the scream since. However there is now a mid level in volume hum that seems to get a little quieter as I drive but never goes away.
I opened the trunk while at idle. The noise with a vibration is coming from
in front of the antennna motor but behind the left rear door almost directly above the wheel well.
Other than the noise it seems to run great.
Fuel pump or sending unit issue? Any suggestions of what to look for is
appreciated.
I am much better at going to a mechanic than being one.
Thanks
bill

__________________
85 300TD

88 560SL

05 SL65 AMG
Reply With Quote
  #2  
Old 04-08-2012, 11:26 AM
Registered User
 
Join Date: May 2006
Location: Old Town, Fl
Posts: 350
The only other thing in that area that could make noise is the sunroof motor. You'll need to remove the trim panel to get access to it.
__________________
82 300SD 202K
82 300SD 233K
83 300TD 340K
82 300TD 98k euro (parts on the hoof)
85 300TD 282K
83 300TD 197K
Reply With Quote
  #3  
Old 04-08-2012, 11:45 AM
Biodiesel300TD's Avatar
|3iodiesel300T|)
 
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
Don't the SD's also have an electric vac pump in the trunk? Someone else here probably knows better though.
__________________
Andrew
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
Reply With Quote
  #4  
Old 04-08-2012, 11:53 AM
toomany MBZ's Avatar
Registered User
 
Join Date: Nov 2006
Location: central Va
Posts: 7,820
Yes, but it's on the other side.

The only other thing close is the sun roof motor.
__________________
83 SD

84 CD
Reply With Quote
  #5  
Old 04-08-2012, 03:36 PM
qsprn
 
Join Date: Apr 2008
Location: WI
Posts: 54
SUN ROOF MOTOR 84 300SD

OK.
Just went out to try. Opened the trunk and started the car. The noise
(Hum) is now also gone. Guess what no longer works. The sun roof will
not open. I can hear it trying (there is the normal sort of whirr sound) but
the sun roof does not move in either direction. It is not used often but I did have it open briefly the day before maybe.
I will do more research but am sure I will be back with more questions.
Thanks especially to Johnt49 and Toomany MBZ for pointing the compass.
Bill

one more thing. Since it sounds like it is trying to open, do I assume it is a broken sun roof cable rather than the sun roof relay or sun roof motor?
Thanks again.
__________________
85 300TD

88 560SL

05 SL65 AMG

Last edited by qsprn; 04-08-2012 at 03:56 PM. Reason: add queston
Reply With Quote
  #6  
Old 04-08-2012, 03:56 PM
Registered User
 
Join Date: May 2006
Location: Old Town, Fl
Posts: 350
It would be a good idea to unplug the sunroof motor until you find out what's going on. No need to risk more damage or a possible electrical melt down! You might want to check the rocker switch to see if it's returning to the middle (off) position and not sticking. Also it could have an internal problem (broken contact floating around inside) causing it to run the motor.
__________________
82 300SD 202K
82 300SD 233K
83 300TD 340K
82 300TD 98k euro (parts on the hoof)
85 300TD 282K
83 300TD 197K
Reply With Quote
  #7  
Old 04-08-2012, 06:24 PM
qsprn
 
Join Date: Apr 2008
Location: WI
Posts: 54
84 300sd sun roof motor

Thanks.
I neglected to say it only tries to open when I press the rocker switch to
open or close. In neutral position, there is no sound at all. I will
unplug it anyway.
Bill
__________________
85 300TD

88 560SL

05 SL65 AMG
Reply With Quote
  #8  
Old 10-24-2012, 07:47 AM
qsprn
 
Join Date: Apr 2008
Location: WI
Posts: 54
Smile update= Problem solved

After checking with a couple of highly recommended repair shops, I decided to have what I thought was a broken cable or mechanism, replaced. When I arrived, the techs realized the sunroof system was a bit
different than they thought. They did give me info on a repair kit available for the drive unit which makes it no longer necessary to replace the whole unit. However they felt they did not have the expertise or tools to fix it for a reasonable cost.
They then called another local shop (Sun Valley Imports in Tempe, AZ)
and asked if they could work on it. One of their technicians seemed familiar with the problem, so I took it there. They said it would take about 30 to 60 minutes to figure out the exact problem.
After 45 minutes, it turned out that the transmission for the sunroof needed adjustment and the cable tension needed adjusting and the track and slides needed lubrication. An hour's worth of labor and no parts later I was on my
way with a working quiet sunroof. I was envisioning a several hundred dollar repair bill. Sometimes it is better to be lucky than smart.
It is also nice to stumble on to an ethical shop with knowledgeable techs.
Thanks again to the Forum members for pointing me in the right direction.
Bill
__________________
85 300TD

88 560SL

05 SL65 AMG

Last edited by qsprn; 10-24-2012 at 07:53 AM. Reason: add sentence
Reply With Quote
  #9  
Old 10-24-2012, 07:51 AM
Registered User
 
Join Date: Jul 2012
Location: North of Boston
Posts: 191
Glad to hear it was that simple (after reading other threads of doom & gloom)

Post the shop (or check to see if they are posted) in the "Good Mercedes shops" section!!
Reply With Quote
  #10  
Old 10-24-2012, 07:59 AM
qsprn
 
Join Date: Apr 2008
Location: WI
Posts: 54
post shop

will do.

__________________
85 300TD

88 560SL

05 SL65 AMG
Reply With Quote
Reply

Bookmarks

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




All times are GMT -4. The time now is 04:22 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, 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