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 06-13-2018, 09:43 PM
Registered User
 
Join Date: Jul 2007
Location: Oregon, Illinois (about 100 miles due west of Chicago)
Posts: 346
2000 S500 HVAC blower not coming on.

The HVAC blower motor will not turn on. We tested the motor by applying 12v directly to it and it works fine. We then installed a new blower motor control regulator to no avail. Finally we installed a replacement dash unit but that also had no effect. The dash unit lights up all the buttons work fine. We ran the diagnostic function on the dash unit but there were no errors. We're stumped as to where to look next.
__________________
2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire
Reply With Quote
  #2  
Old 06-14-2018, 05:19 PM
Registered User
 
Join Date: Jan 2012
Posts: 6,322
If this has the 97 era HVAC display, go to the data screen ( key on / display showing that the HVAC is on and fan requested to run / Press and hold the REST button until you see a alternating " 01 " and a " value " .


Using the fan + and - buttons, scroll until you find the fan control voltage ( or similar ) display. ( I don't have chart handy. )

At the fan controller, measure voltage between the small signal wire and ground, it should match the voltage on the display. If not, find this wire on the HVAC control and measure voltage there. If you have voltage at the HVAC control, the signal wire is broken.
Reply With Quote
  #3  
Old 06-15-2018, 07:46 AM
Registered User
 
Join Date: Jul 2007
Location: Oregon, Illinois (about 100 miles due west of Chicago)
Posts: 346
Fixed!

Turns out the trouble was in the fuse box. The red/yellow wire going to the blower regulator had a fusible link in it which was open and the wire on both sides of it, while not burned, were well cooked. We cut out the link, along with the cooked wire and patched in a fuse holder with a 40 amp fuse. It now works perfectly.
__________________
2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire
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 02:56 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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