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 ShopForum > Technical Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-06-2010, 12:06 AM
Registered User
 
Join Date: May 2009
Location: sw okla.
Posts: 51
Blower motor problems....

The blower motor on my 93 300sd started acting weird a while back. Sometimes you could control the speed with the control panel and other times not.Then it started pulsing high/lo and would eventually settle and blow on high only. The other day it quit altogether,it has came on a time or two but quit after a few seconds. I am pretty sure the motor is still good. I think it may be a relay or control module problem. Anyone have any suggestions or ideas? Where is the blower motor located,I looked behind the glove box,I seem to remember some of the earlier ones were in the center behind the controls.If it is the relay/control module where might it be?
Reply With Quote
  #2  
Old 09-06-2010, 01:34 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,967
The blower motor is on the engine bay side of the glove box, where older MBs have the battery. Disconnect the red and green vacuum hoses and remove the screws and clips holding the airbox lid to expose the blower. Follow the heavy gauge red and blue motor wires to the solid state controller. If you're handy with a VOM, you can check whether the voltage pulsing comes from the signal from the dash control unit or the blower controller.

Sixto
87 300D
Reply With Quote
  #3  
Old 09-06-2010, 02:45 AM
Registered User
 
Join Date: May 2009
Location: sw okla.
Posts: 51
Thanks,I will go out to the garage and check under the hood.
Reply With Quote
  #4  
Old 09-06-2010, 03:56 AM
Registered User
 
Join Date: May 2009
Location: sw okla.
Posts: 51
Found what I believe to be the problem,there is a black module type thing bolted to the top of the blower motor. There are 4 wires going into it,when I moved the wires around the motor would start and stop. I finally found a good position and it would continue to run. I am guessing that would be the solid state controller and it is in need of replacement.
Reply With Quote
  #5  
Old 09-06-2010, 12:39 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,967
Not a cheap part -

http://catalog.peachparts.com/ShopByVehicle.epc?q=1993-Mercedes--Benz-300sd-Climate--Control&yearid=1993%40%401993&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6211:ED|10000113:MBC|1511%40%40300SD&catid=242213%40%40Climate+Control&subcatid=242297@@Blower+Regulator&mode=PD

Don't forget some heat sink grease for the aluminum base.

Sixto
87 300D
Reply With Quote
  #6  
Old 09-06-2010, 01:23 PM
Renntag's Avatar
User Especial
 
Join Date: Jul 2008
Location: Kona, Hi
Posts: 1,385
Enlarged to show detail

Ouch. not cheap is right.

What year did MB start using this in the W126?

I removed the fan assy on my '86 W126 from under the glove box are to clean of dirt/devris and then lube the bushings to extend its life.

Here is the offending part mentioned above. What years/models did this appear?
__________________
83 300TD (need rear wiper assembly dead or alive)
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.
Reply With Quote
  #7  
Old 09-06-2010, 02:26 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,967
That's a W140 part. The W126 uses a similar device attached to a heat sink with posts. Often called a porcupine -

http://www.carpartsdiscount.com/auto/viewer/pictures/63808/1000/1/P/2C496E4/mercedes_560sel_behr_heater_fan_resistor_oem_126_820_53_10_1268205310.html

Similar price too

US W126s from 1986 use the solid state contoller but I don't know if it's the same part through 1991. Earlier W126s use a resistor pack.

Sixto
87 300D
Reply With Quote
  #8  
Old 09-06-2010, 02:32 PM
Registered User
 
Join Date: May 2009
Location: sw okla.
Posts: 51
Not cheap is right.Is there anyway around this like maybe a relay or something. Or possibly an older style reostat type blower motor resistor? I know it's probably wishful thinking right. Anybody know what all models use this? Thanks
Reply With Quote
  #9  
Old 09-17-2010, 08:24 PM
Wired_Bob's Avatar
Registered User
 
Join Date: Oct 2006
Posts: 20
Check the brushes for wear. Mine acted that way. Closing the door might start the blower working and a few miles later it would stop. Gave all the indications that the control circuits were at fault. I moved the straps on the brushes to allow contact and works fine now.
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 06:44 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page