'85 190E 2.3 rad fan system not working - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 07-16-2009, 02:15 PM Thread Starter
BenzWorld Newbie
Date registered: Jul 2009
Posts: 4
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
'85 190E 2.3 rad fan system not working

Hi, just replaced son's water pump, checked wires to the fan magnet unit but fan does not engage. Noticed this problem prior to old pump going bad. Wondering where is the senor with the temp and lead wires, or are there more than one unit that tells and sends the electrical current to the fan clutch at the fan? If I stand in front of the engine bay and look down on this four (4) cylinder engine, where is this temp unit (or others that pertain) relative to the thermostat housing unit on the right side of head front? Is there a way to check these sensors or just replace? Got a part source or is my dealer the right way to go? If aftermarket, Napa, CarQuest, etc. got the numbers?

As a new member, I want to thank those who wish to help.

I also have an '85 4 door matching parts car blue/blue if you have needs.
oldspyder is offline  
Sponsored Links
post #2 of 3 (permalink) Old 07-18-2009, 05:55 PM
BenzWorld Elite
MTI's Avatar
Date registered: Aug 2002
Vehicle: '85 2.3-16 '99 C280 '11 GLK350
Location: Scottsdale, Arizona, USA
Posts: 4,805
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
The coolant temp sensor is at the forward part of the block, near the distributor, typically it has a red plastic cap with a two prong top. You can test the magnetic fan clutch by removing the wire harness to the sensor and by using a short piece of wire, short the terminals in the harness, which should cause the fan to spin.

If it does spin, the culprit is likely the sensor. If it doesn't spin, then it could be the wire harness or the fan clutch itself.
MTI is offline  
post #3 of 3 (permalink) Old 07-20-2009, 09:46 AM Thread Starter
BenzWorld Newbie
Date registered: Jul 2009
Posts: 4
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
2.3 190E '85 rad fan switch

I located that sensor with the red base, however, it appears to have three (3) wires attached. Two that go on one side, with one on the other. So, in response to your kind advice previously, how do I use the wire splice to test with three wires when you suggested it might be two wires? I am not very electrical at all, have some confidence, enough to do what is needed when knowing what to do. Thanks ahead of time.
oldspyder is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode

    Similar Threads
    Topic Author Forum Replies Last Post
    C220 rad fan removal?? Logan909 W202 C-Class 8 09-29-2014 06:17 PM
    190E Six speaker system (Door speakers not working) Guest (MBNZ) W201 190-Class 56 06-23-2008 06:36 PM
    190D Electric Rad fan won't shut off Moodie General Mercedes-Benz 2 04-25-2005 10:29 PM
    1989 190E auxiliary fan not working kytrex W201 190-Class 1 06-23-2004 05:00 PM
    Auxiliary fan - front of rad. UPDATED QUESTION geord W126 S,SE,SEC,SEL,SD,SDL Class 0 03-27-2003 05:29 PM

    Posting Rules  
    You may post new threads
    You may 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 Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On


    Title goes here

    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome