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 06-19-2004, 10:52 PM
Registered User
 
Join Date: May 1999
Location: Oklahoma City, OK, USA
Posts: 28
Aux fan cycles on/off

My 1991 190E 2.3 aux fan has recently started cycling on and off pretty frequently, like every couple of seconds. It doesn't always do it, but will once the temperature has gotten to aobut 80C. It was operating fine, coming on at 100 C like it should, but then started operating erratically. It does it without the A/C operating, so I don't think it's the high pressure switch. I measured the resistance of the coolant temp sensor, and it was about correct. Any suggestions as to the cuplprit? It seems as though it should be the coolant temp sensor, but it seems to check out. Thanks for your suggestions!

__________________
Ted Beer
'91 190E 2.3
Reply With Quote
  #2  
Old 06-20-2004, 10:40 AM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
First..
Check the CT sensor [ high speed fan] connection...clean the
plug/connector.
If the ECU sees an open connection there , it defaults into high fan circuit.
If connection is good, You could have an intermittent bad sensor...

Last edited by Arthur Dalton; 06-20-2004 at 11:06 AM.
Reply With Quote
  #3  
Old 06-22-2004, 10:57 PM
Registered User
 
Join Date: May 1999
Location: Oklahoma City, OK, USA
Posts: 28
A little more information on the aux fan cycling. I pulled the connector on the coolant sensor, and to my surprise, the fan continued cycling on and off. I'm sure I have the right 4-pin, but without being connected, I would have expected to have the fan not run at all, or to run all the time. I'm pretty confident that the sensor is fine. It has all the correct resistance values over a range of temperatures. I don't understand where the ecu is getting the signal to turn the fan on and off. I can hear the relay pulling in and out. Any other ideas?
Thanks!
__________________
Ted Beer
'91 190E 2.3
Reply With Quote
  #4  
Old 08-13-2004, 05:20 PM
Registered User
 
Join Date: Jun 2003
Location: Southern Cali
Posts: 81
Did you ever figure this out?
Reply With Quote
  #5  
Old 08-14-2004, 12:49 AM
pmizell's Avatar
Benz Zealot
 
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
The ACC temp sensor that you should be looking for is 2 pole blue not the 4 pole black at the rear of the head.

__________________
-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
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 07:00 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, 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