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 10-15-2009, 04:14 AM
Registered User
 
Join Date: Mar 2008
Location: Toronto, Canada
Posts: 171
Testing aux fan circuitry

I am wondering if anyone knows how I could check the circuitry of my auxillary fan. I've seen a thread before but could not find it by searching. I've noticed as well that there is a switch on my thermostat housing with one lead that looks like it is for the aux fan but have NO idea how it works or how to test it.

Thanks!

Reply With Quote
  #2  
Old 10-15-2009, 11:26 AM
snookwhaler's Avatar
Linesider
 
Join Date: Feb 2009
Location: Treasure Coast, FL
Posts: 1,417
I'm not too sure about the 78 but on my 85 there is a pressure switch and a temp. switch on the drier.

Crossing the leads on the temp. switch should cause the aux. fan to run with the key on. But, like I said. That is on the 85.

I'm sure someone on here has a wiring diagram for your car. That system is pretty easy to troubleshoot.
__________________
AJ

1985 300D (SOLD)

Reply With Quote
  #3  
Old 10-15-2009, 02:00 PM
Registered User
 
Join Date: Mar 2008
Location: Toronto, Canada
Posts: 171
Well there are two switches on my receiver/dryer. One at the top which is showing continuity and one on the side that is electrically open. I jumped those two wires, turned the key and nothing!
Reply With Quote
  #4  
Old 10-15-2009, 05:00 PM
snookwhaler's Avatar
Linesider
 
Join Date: Feb 2009
Location: Treasure Coast, FL
Posts: 1,417
There should be a plug over by the fan where the fan wiring goes through the rad. core support.

Pull the plug and check for voltage there and see what you got. Try it with the temp. switch leads crossed again too.

Could be a bad fan. The fan is repairable. But, there are some other things to check too. I forget what they are. I did all of this months ago. There is a good wiring diagram on here somewhere. Hopefully someone will know where it is. I don't feel like searching right now.

__________________
AJ

1985 300D (SOLD)

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 06:35 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, 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