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 > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-14-2000, 07:11 PM
Registered User
 
Join Date: May 1999
Location: Charlotte, NC, USA
Posts: 688
Have a friend changing out his evaporator in his '91 124 (yup, another!) but before he tackled it his HVAC would not blow. The pushbutton unit has been rebuilt and it runs if you jumper the blower directly, but it will NOT run via pushbuttons. Where would the next logical place to look in this case?
Should have the dash back in by the weekend.

Thanks for the help....
Tobias MB
C280 Sport, 300CE, 400E, 190/5.0
Reply With Quote
  #2  
Old 11-14-2000, 09:54 PM
Registered User
 
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
The only thing the pushbutton unit does is send a reference signal to the blower regulator. The regulator is under the blower motor and would be easy to get to with the heater box out.

The signal is 1-8volts on the yellow wire.

------------------
Benzmac:
Donnie Drummonds
300E
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
OWNER OF MB AUTOWERKS .COM
Reply With Quote
  #3  
Old 11-18-2000, 05:32 AM
Registered User
 
Join Date: May 1999
Location: Charlotte, NC, USA
Posts: 688
Donnie, thanks...there was voltage on the yellow wire so the regulator is defective.
This design is also used on Alfa 164 sedans and if the blower motor needs replacing it usually takes out the regulator with it. It probably overheats as the large heat sink attached has no air passing over it to cool
the regulator. Wonder how many other cars use that regulator as they are not rebuildable. List is over $210!

Tobias MB
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS 300e w124 PARTS ON EBAY!!!!!!! 6cndmbz Mercedes Used Parts For Sale & Wanted 4 09-20-2003 01:14 PM
HVAC blower motor Question: blahargoue Tech Help 0 09-14-2003 11:06 AM
w124 300e blower fan works sometimes whair Tech Help 6 09-12-2003 05:55 PM
What is the most common Benz? vanakin Off-Topic Discussion 14 12-07-2002 06:34 PM
Comparing C240 to 300E LarryBible Featured Cars 29 08-15-2002 04:34 AM



All times are GMT -4. The time now is 05:30 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, 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