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
  #16  
Old 06-18-2005, 11:38 AM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
OK

Everything ponts to a bad fan motor/wire connection

Are you sure that the fan you used for test is good .. this is very important cuz if you are not positve about that, it throws off the diagnosis..
I would separate the fan and try each alone .. If you have an amp meter , I would also get some draw readings
Lastly, you could also have a high draw caused by bad wire connections .. the most suspect on these will be at the fuse terminals, at the base of the relays [ there are two, located in slots B and C behind fuse box], at the dropping resistor. and the ground side of the fans..

Reply With Quote
  #17  
Old 06-18-2005, 05:18 PM
Registered User
 
Join Date: Jun 2005
Location: Phoenix, voted sweatiest city
Posts: 43
Checked my fans last night. They draw about 18.5 amps at startup and 11.4 when running on low from the A/C pressure switch. I would go with 25 amp fuses at least.
Unplug one motor at a time and check the draw for each.
Reply With Quote
  #18  
Old 06-19-2005, 09:41 PM
Registered User
 
Join Date: Jun 2005
Posts: 24
Well it turns out that the fan that I used to diagnose the problem isn't so new and isn't so good. What I did was I tested each of the two fans separately. The right one (driver's) is good and spins freely and very fast, no blown fuse. The left one spins very slow and although the fuse didn't blow right away, it did get pretty hot as well as the wiring so I simply aborted the test and called it a day. Also, when spinning by hand, the left one seems to have a lot of resistance but the right one spins effortlessly.I guess I will be in the hunt for a fan. I disconnected the bad one and left the good one plugged. I'm not running the A/C at the moment as I need a recharge so I'll be using the good fan when the engine gets hot. By the way, which fan is the low speed and which one is the high speed (harness).
Again, thanks to all that responded and gave very good advice, especially Arthur who has stayed with me all the way. I only hope that I can provide some assistance to someone else as I gain knowledge and experience with our cars. Thanks everyone!!!
Reply With Quote
  #19  
Old 06-19-2005, 09:55 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
<>

Booo... Hissss..

I knew you threw me a curve ball with that other fan..

..anyway, the fans are wired in parallel, so it will run with just one .
as far as speed , there is no high fan and low fan motor, The speed is determined with which circuit is being used
The low speed is the a/c circuit , using the dropping resistor to get low fans .. and the high speed is the engine coolant temp sensor hitting 105 C and sending power to the fans without the dropping resistor , resulting in full power/high fan..two different circuits sharing common fan motors only..
but with a bad motor , you will blow fuses, no matter which speed/system you are using..

Reply With Quote
Reply

Bookmarks


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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bosch Aux Fan - New Bearing/Rebuilt - 123 Body TomJ Mercedes-Benz Used Parts For Sale & Wanted 16 07-30-2019 12:20 AM
Testing aux fan switch on thermostat jriewer Tech Help 0 06-06-2004 07:50 PM
Aux Fan Repair! MBWayne Diesel Discussion 2 07-18-2002 11:36 AM
aux fan blues JHZR2 Diesel Discussion 5 07-14-2002 03:49 PM
300E Aux Fan Replacement EstebanSPI Tech Help 1 04-02-2002 05:19 PM



All times are GMT -4. The time now is 03:41 AM.


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