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

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-08-2008, 11:27 AM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Blower Motor

Nothing: Where is the blower motor, and does it have a separate fuse. 89 420sel

Reply With Quote
  #2  
Old 11-08-2008, 12:09 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,765
The blower motor is under the wiper motor.

There is a separate fuse I believe, it is in its own holder on the driver-side inner fender. Small black flip-top fuseholder, one wire out each side. Special M-B item.
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #3  
Old 11-08-2008, 05:05 PM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Thanks i will have a look.
Reply With Quote
  #4  
Old 11-08-2008, 06:09 PM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Quote:
Originally Posted by babymog View Post
The blower motor is under the wiper motor.

There is a separate fuse I believe, it is in its own holder on the driver-side inner fender. Small black flip-top fuseholder, one wire out each side. Special M-B item.
Is this it?http://www.peachparts.com/shopforum/attachments/tech-help/60725d1226182067-blower-motor-fuse012%5B2%5D.jpg
Attached Thumbnails
Blower Motor-fuse012%5B2%5D.jpg  
Reply With Quote
  #5  
Old 11-08-2008, 06:31 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,765
Looks like it, although the fuse doesn't look right.
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #6  
Old 11-08-2008, 07:48 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
That is it, but someone has tapped into that circuit for power to something else...which could be a problem. To test that strip fuse , you want to test for power on each side to ground for 12v. b/c they get a hairline crack that is not detectable by eyeballing it.

Where does that added RED wire/fuse holder go to ???????????/
__________________
A Dalton
Reply With Quote
  #7  
Old 11-09-2008, 12:39 AM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Quote:
Originally Posted by Arthur Dalton View Post
That is it, but someone has tapped into that circuit for power to something else...which could be a problem. To test that strip fuse , you want to test for power on each side to ground for 12v. b/c they get a hairline crack that is not detectable by eyeballing it.

Where does that added RED wire/fuse holder go to ???????????/
The PO installed an alarm.It's been there for years with no problem.I will test for power.
Reply With Quote
  #8  
Old 11-09-2008, 01:08 PM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Quote:
Originally Posted by Arthur Dalton View Post
That is it, but someone has tapped into that circuit for power to something else...which could be a problem. To test that strip fuse , you want to test for power on each side to ground for 12v. b/c they get a hairline crack that is not detectable by eyeballing it.

Where does that added RED wire/fuse holder go to ???????????/
Checked voltage on both sides and all is ok.Removed Red wire.If i must replace the blower motor,are there any step by step info with pictures for a 420sel?
Reply With Quote
  #9  
Old 11-09-2008, 01:15 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
I would test for power at the 3 wire blower feed plug on firewall before digging in to get to the blower.
__________________
A Dalton
Reply With Quote
  #10  
Old 11-09-2008, 04:14 PM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Quote:
Originally Posted by Arthur Dalton View Post
I would test for power at the 3 wire blower feed plug on firewall before digging in to get to the blower.
O.K I will do that next.
Reply With Quote
  #11  
Old 11-09-2008, 04:31 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Behind the brake booster is the 3 wire plug .

With key ON , you want 12v from red to blk..then you want a variable voltage [ from 2-9 aprox] from the yellow to blk, depending on where the fan speed selector is at. That is the trigger voltage for the regulator and you have to check that first b/c many guys change the regulator at great cost only to find out they simply had no trig V at the yellow wire..NO Trigger V. = No fan. And no trigger can be a simple CC panel fuse or bad ign sw.

If you have those 3 test as verified at the connector/plug, then you have to go down to blower motor..the simple test there is to ground the blue wire with a jumper wire to ground..if you then get High Fan, the problem is the Regulator [ providing you know you have Variable trigger at yellow wire at regulator.]

A word of caution for the fuse link that you verified.
The best test for that is to jumper it with a fused jumper wire b/c they can test fine w/DMM until the fan circuit puts a load on the fuse ..it then opens up...so a quick jumper there may save you a lot of false diagnostics..........
__________________
A Dalton
Reply With Quote
  #12  
Old 11-09-2008, 04:48 PM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Quote:
Originally Posted by Arthur Dalton View Post
Behind the brake booster is the 3 wire plug .

With key ON , you want 12v from red to blk..then you want a variable voltage [ from 2-9 aprox] from the yellow to blk, depending on where the fan speed selector is at. That is the trigger voltage for the regulator and you have to check that first b/c many guys change the regulator at great cost only to find out they simply had no trig V at the yellow wire..NO Trigger V. = No fan. And no trigger can be a simple CC panel fuse or bad ign sw.

If you have those 3 test as verified at the connector/plug, then you have to go down to blower motor..the simple test there is to ground the blue wire with a jumper wire to ground..if you then get High Fan, the problem is the Regulator [ providing you know you have Variable trigger at yellow wire at regulator.]

A word of caution for the fuse link that you verified.
The best test for that is to jumper it with a fused jumper wire b/c they can test fine w/DMM until the fan circuit puts a load on the fuse ..it then opens up...so a quick jumper there may save you a lot of false diagnostics..........
WOW:Elect.is not one of my best Qualities.I will give it a try.
Reply With Quote
  #13  
Old 11-09-2008, 04:58 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
You can make these test with a simple 12v test lamp...so that might make it easier for you.
I only want you to know that all these test are made right from the test connector plug before you go down into the blower motor compartment.
iIsee so many guys rip stuff all apart for nothing when the testing connections are right there on top of the firewall....
__________________
A Dalton

Last edited by Arthur Dalton; 11-09-2008 at 05:03 PM.
Reply With Quote
  #14  
Old 11-09-2008, 05:34 PM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Quote:
Originally Posted by Arthur Dalton View Post
You can make these test with a simple 12v test lamp...so that might make it easier for you.
I only want you to know that all these test are made right from the test connector plug before you go down into the blower motor compartment.
iIsee so many guys rip stuff all apart for nothing when the testing connections are right there on top of the firewall....
http://www.peachparts.com/shopforum/attachments/tech-help/60749d1226266304-blower-motor-th_plug001.jpg
th_Plug001.jpghttp://www.peachparts.com/shopforum/attachment.php?attachmentid=60750&stc=1&d=1226266318
th_Plug002.jpg This is all i could find.
Attached Thumbnails
Blower Motor-th_plug001.jpg   Blower Motor-th_plug002.jpg  
Reply With Quote
  #15  
Old 11-09-2008, 06:37 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Let me see if the schematic gives the connector exact location ...
I thought it was behind the booster on that chassis.

__________________
A Dalton
Reply With Quote
Reply

Bookmarks


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 09:31 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page