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 09-29-2009, 11:16 PM
d.delano's Avatar
Dönerkebap
 
Join Date: May 2004
Location: DC
Posts: 1,466
engine temp vs. ACC sensor

1993 190E 2.6 M103 engine

I have a sensor between the air cleaner box and valve cover on the driver's side, looks like a blue two-connector. Which is this? Also, where would the green 3-prong engine temp sensor be located? I need to stop the aux fans from spinning on high intermittently, and have been advised these may be culprits. Any advice on using a voltmeter to troubleshoot these? I'd rather see if they are bad before replacing them. I have a voltmeter, but wouldn't know what to set the selector to or what values to consider when testing these sensors. Thanks

__________________
'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)
Reply With Quote
  #2  
Old 09-30-2009, 08:26 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Aux fan sensor on that car is a blue 2 pole sensor
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 09-30-2009, 01:01 PM
d.delano's Avatar
Dönerkebap
 
Join Date: May 2004
Location: DC
Posts: 1,466
alright, thanks - so where is the green 3-pole sensor located? Can't find it
__________________
'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)
Reply With Quote
  #4  
Old 09-30-2009, 04:38 PM
JimF's Avatar
'94 S500: only 793 sold!
 
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,933
Quote:
Originally Posted by d.delano View Post
1993 190E 2.6 M103 engine

I have a sensor between the air cleaner box and valve cover on the driver's side, looks like a blue two-connector.
As MB-Doc stated, that is the Aux Fan sensor.

Quote:
Originally Posted by d.delano View Post
I need to stop the aux fans from spinning on high intermittently, and have been advised these may be culprits.
Culprit?? If the A/Fans spin, high or otherwise, it's b/c they NEED TO! There's nothing wrong. Menu#18 shows how the sensor works w/ the A/C and Aux Fans.
__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page

Last edited by JimF; 10-01-2009 at 01:47 AM.
Reply With Quote
  #5  
Old 09-30-2009, 05:27 PM
d.delano's Avatar
Dönerkebap
 
Join Date: May 2004
Location: DC
Posts: 1,466
Quote:
Originally Posted by JimF View Post
As MB-Doc stated, that is the Aux Fan sensor.


Culprit?? If the A/F spin, high or outwise, it's b/c the NEED TO! There's nothing wrong. Menu#18 shows how the sensor works w/ the A/C and Aux Fans.

Thanks Jim but as I stated it's an intermittent on/off when the engine temp is normal, as if somebody is getting their jollies flipping a switch on and off. Definitely not normal. Now - where is that green 3-prong engine temp sensor located again?
__________________
'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)
Reply With Quote
  #6  
Old 10-01-2009, 01:46 AM
JimF's Avatar
'94 S500: only 793 sold!
 
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,933
Is the A/C on? If so, then it's normal since a burst of high pressure causes the second part of the ckt electronics (pressure switch on the rcvr-dryer) to turn the aux fan on to cool the evaporator even though engine temp is normal.

My 190E did that alot!
__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page
Reply With Quote
  #7  
Old 10-01-2009, 05:09 AM
Registered User
 
Join Date: Jul 2009
Posts: 254
My aux fans would go on and off randomly, normal temp, no A/C. I replaced the blue/two-prong sensor and it all works fine now. I don't have a three-prong sensor on my 91 2.6. Can't help you there.
Reply With Quote
  #8  
Old 10-01-2009, 12:12 PM
d.delano's Avatar
Dönerkebap
 
Join Date: May 2004
Location: DC
Posts: 1,466
Quote:
Originally Posted by long-gone View Post
My aux fans would go on and off randomly, normal temp, no A/C. I replaced the blue/two-prong sensor and it all works fine now. I don't have a three-prong sensor on my 91 2.6. Can't help you there.
That's what mine does - so I guess testing would be a waste of time. I'll just get a new one.

__________________
'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(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 08:36 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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