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 > ML, GL, G-Wagen, R-Class, Unimog, Sprinter

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-22-2004, 05:36 PM
Registered User
 
Join Date: Jul 2002
Location: New Oxford, Pa.
Posts: 6
Radiator fans

When should the auxillary radiator fans come on in my 1999 ML320? I asked the service department at my dealer and was told they cycle with temperature. I ask if they came on with the air conditioner like in my 190E and was told no. Is this true or were they putting me on. The temp even on hot days with the AC on is just above 80 c. An independant mechanic told me the fans should come on with the AC. What is true? Also I have been reading about a wiring harness modification on the AC fan fuse. Can anyone tell me more about this modification and why it is necessary?

Any help would be appreciated,

Cliff

1999 ML320

Reply With Quote
  #2  
Old 05-22-2004, 07:27 PM
azinn's Avatar
Senior Member
 
Join Date: Jun 2003
Location: The Sunshine State
Posts: 487
If you have the original wiring harness and fuse you need the upgraded versions. The fans should run when the air is on. If you are the original owner of your truck you might be able to get them to goodwill the upgrade. See this thread Aux fans blowing Fuse 44 (ML series) Good luck

Last edited by azinn; 05-22-2004 at 07:37 PM.
Reply With Quote
  #3  
Old 05-22-2004, 09:21 PM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Quote:
I ask if they came on with the air conditioner like in my 190E and was told no. Is this true or were they putting me on.
This is not true. I can't tell you if they were "putting you on", but the statement is false. The fans come on with the AC high pressure switch, so not "automatically" with the AC, but under certain circumstances they will, even if the engine isn't very hot.

Find and check fuse 44 in the main fusebox and see if it's blown. If it is, the different harness for the aux fans likely needs to be installed. Read the link in azinns post, should explain everything pretty well.

Gilly
Reply With Quote
  #4  
Old 05-23-2004, 01:09 PM
Registered User
 
Join Date: Jul 2002
Location: New Oxford, Pa.
Posts: 6
Thanks for your help. I do have a question, one end of the green whire goes to the fuse block, where does the other wire go. At the fan connector I have two green wires and two brown wires. Will I need a tool to remove the pin from the connector. Gilly indicated the connector comes apart to replace the pin or socket. Is there a trick to getting it apart?

Next question can anyone tell me what the AC pressures should be, Low side and High side?

Thanks
Cliff
Reply With Quote
  #5  
Old 05-23-2004, 08:03 PM
Ron in SC's Avatar
Registered User
 
Join Date: Aug 2003
Location: Charleston, SC
Posts: 1,095
Have you purchased your new harness yet?
Reply With Quote
  #6  
Old 05-24-2004, 06:46 AM
Registered User
 
Join Date: Jul 2002
Location: New Oxford, Pa.
Posts: 6
Ron,
I have not purchased the new harness yet. I am still researching to see If I can do the job myself. I have not checked the price of the harness or what it looks like. From all the information so far has me believeing it is just one wire with sockets on both ends.
Reply With Quote
  #7  
Old 05-24-2004, 09:22 AM
Ron in SC's Avatar
Registered User
 
Join Date: Aug 2003
Location: Charleston, SC
Posts: 1,095
Cliff,

I asked that question because I’m not certain I understood yours.

The new harness had either one or two wires that you route into the fusebox. One for sure is green. You remove the old green wire from ML/B connector and connect the new one in its place. They do make a special tool to easily remove the wires from the connectors but I don’t have one. I used an eyeglasses screwdriver to get mine out.

If there is another wire that gets routed into the fusebox maybe it was a ground. If you get a harness post a photo and hopefully it will refresh may recollection or someone else will have the answer. I remember it was not hard to tell what was what once I finally identified ML/B.

As far as the plug connector at the fans you get a new connector with the wires and all that you just plug in after you unplug the old one, nothing to that.

Edited:

If there was another wire that gets routed into the fusebox besides the green one it might go to ML/B connector too. That means you will remove both of the existing wires from ML/B


Last edited by Ron in SC; 05-24-2004 at 09:40 AM.
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 12:55 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