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Thread: E39 Aux Fan Service - READ ON

  1. #26
    Join Date
    Jan 2007
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    West Michigan
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    14,422
    My Cars
    98 540iA (Prd 11/97)
    Great thread. Thx for the info!

  2. #27
    Join Date
    Oct 2004
    Location
    Falls Church, VA
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    1,039
    My Cars
    '90 325iX, '00 528iT spo
    Just ordered my motor from autozone online. We'll see what it looks like when it arrives. My peake tool is throwing a 7d code which translates to auxillary cooling fan final stage. All fuses check out OK. replaced temp sensor in lower radiator hose already so ... will R&R the motor.

    Also ordered #67328371873 per realoem.com for my wagon which is the AC and Heat - Condensor fan - resistor. Realoem.com lists it as a "repair kit resistor".

    Thanks for the tip.
    Jason

    '90 325iX 5M, '00 528iT 5M Sport (mfg. 5/1999)
    BMW CCA member #130075
    JScott Racing

  3. #28
    Join Date
    Aug 2006
    Location
    Nashville
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    506
    My Cars
    E34, E36
    i can't seem to find just the aux fan motor anywhere. any tips? direct links??

  4. #29
    Join Date
    May 2004
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    Florida
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    F15, F31
    I'm rarely on bf.com nowadays, but seeing this old thread reactivated I'd like to add: please read the posts carefully and I'm sure you guys can figure it all out by yourself

    Quote Originally Posted by NNY528I View Post
    Any one know off the top which wire in the resistor pack goes to which pin in the connector. I was hopped up on coffee after a late night run and failed to note there positions when i pulled them out. The 2 in question are the black and the black and red.Thanks,
    Quote Originally Posted by PENER View Post
    additional info: the connector for the fan consists of four wires:
    brown-ground
    blue-12v direct to fan, high mode
    red-12v through single resistor to fan, med mode
    black-12 through both resistors (in series) to fan, low mode

    As far as the resistors, both are exactly the same. which one hooks up where is clearly stated in my original post (see quote above). brown wire is ground to the motor. blue is direct 12v to the motor. red goes from the harness through the single resistor and connects to the blue (that's what the stripped part of the blue wire is for) wire. black also goes from the harness through other resistor, then connects to the red wire (before the first resistor on the red wire!!!). in other words...

    Brw..Blu...Red...Blk ................R-resistor..............edit: dots (....) mean nothing, w/o them the pic would get messed up
    |.....|......|......|
    |.....|......|......R
    |.....|......|......|
    |.....|......|..... /
    |.....|......R..../
    |.....|......|../
    |.....|......|/
    |.....|....../
    |.....|..../
    |.....|../
    |.....|/
    |.....|
    \.../
    fan

    of course the resistors are wired all close to the fan so they can be exposed to the air flow. after all, being the resistors, they can get really hot!
    Last edited by PENER; 09-03-2007 at 11:53 AM.
    2015 F15 xDrive35i M-Sport, Mineral weiss on mokka Design Pure Excellence
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  5. #30
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    Jun 2005
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    Atlanta/Canada
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    '00 M5 '02 325xit
    Quote Originally Posted by PENER View Post

    additional info: the connector for the fan consists of four wires:
    brown-ground
    blue-12v direct to fan, high mode
    red-12v through single resistor to fan, med mode
    black-12 through both resistors (in series) to fan, low mode


    I am confused...

    My fan only has 3 wires
    1 small balck wire
    1 big red wire
    1 big blue wire

    I connected both big wires to a battery and the fan will not turn on?


    BTW: BAD NEWS GUYZ


    Autozone doesnt carry that item anymore. I just went to them and they pulled it up on the computer and it show you can buy it anymore.
    Last edited by jfboy; 06-28-2008 at 04:02 AM.

  6. #31
    Join Date
    Apr 2005
    Location
    Baltimore, MD
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    Blown 530
    Just pulled this assy off during this week. Wow, it's heavy for a fan.

  7. #32
    Join Date
    Apr 2005
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    Baltimore, MD
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    Blown 530
    Can we put this in the DIY section? It was extremely handy this weekend.

  8. #33
    Join Date
    Sep 2006
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    East Coast
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    Pull n Release
    Quote Originally Posted by Jackcat559 View Post
    Can we put this in the DIY section? It was extremely handy this weekend.
    Done

    Another FP5241 Creation
    Parting out M54 Engine. Intake and all. Cats avail as well. PM ME!

  9. #34
    Join Date
    Apr 2005
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    Baltimore, MD
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    Blown 530
    Thanks Gumbi

  10. #35
    Join Date
    Apr 2005
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    Baltimore, MD
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    Blown 530
    Here are some pics from this weekend. I beleive the motor is bad. The contacts had a minor amount of corrosion that was cleared up with a little contact cleaner.

    The fan has 14V DC suppied.
    Brown looks to be ground, and the other two must be high & low.


    The motor only registered in kilo-ohms.


    In going to check out the local supply companies to see if the motor is available.

  11. #36
    Join Date
    Apr 2008
    Location
    Ottawa, Canada
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    22
    My Cars
    '97 528, 2007 Cobra
    I couldn't find the motor at the local parts houses but found a cross reference to a Four Seasons model. Ordered from below and the Siemens motor showed up with the right pins on it and the hook up for the resistors. A plug and play replacement for much less than the complete assembly shown by most online places!

    I'm not allowed to post links yet but search for FS75720 at autopartswarehouse.com It's listed for a '97 740 but is the same as mine '97 528

  12. #37
    Join Date
    Apr 2009
    Location
    Long Beach
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    23
    My Cars
    528i
    where is the radiator temp switch located? I would like to test the motor to see if its not the cause for it not operating

  13. #38
    Join Date
    Jan 2007
    Location
    Berkley MI
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    1,458
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    2009 C350

    Revival

    Can anyone confirm that this motor will work on 98+ cars? According to Siemens this is only for 96 and 97 MY E39s.They also don't list anything for the later years. Autozone doesn't carry this anymore, but apparently Pepboys does with special order.

  14. #39
    Join Date
    Apr 2010
    Location
    Harrisburg, PA
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    30
    My Cars
    2003 525i sedan
    My A/C wasnt blowing correctly on my recent 2003 525i. I checked the aux fan and it was at a stand still. I turned the blades slightly and it started after a few seconds and the a/c started again- but not great. What is the issue:fan motor, resistor, or something else?

    Thanks John

  15. #40
    Join Date
    May 2010
    Location
    pittsburgh
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    99 528i
    whats the difficulty on this? I'm a beginner and I think this will need done soon to my car, BUT if its difficult then I may just go to a shop. Any ideas on how much this would cost at a shop?

  16. #41
    Join Date
    Jun 2010
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    Laurel, Maryland
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    2003 BMW 525i sedan
    Quote Originally Posted by NY550i View Post
    Can the motor be making noise or just the blades?
    Im actually having issues with my aux fan... it is way to loud! once the car warms up to normal temperature the aux fan goes on and the car idles with a loud fan

    I took the car to a indy and they replaced the whole aux fan with a new one and it still made noise so they said the fan might be defective so they will replace it with another new unit... im starting to believe the problem is not in the fan but something else
    I had this same issue about a month ago... I took my bimmer to the autobahn shop in Laurel... The mechanic told me that it was the aux fan and it would cost 680.00 not me I went down to brandywine a local junkyard (lifetime warranty on all parts) and picked up a fan for 250.00 and installed myself. GUESS WHAT!!!!!! the new/used aux fan is still LOUD .... Then the little light bulb came on. Let me check the coolant temp. sensor 23.00 at bavauto.com (sits on the lower radiator hose) and VIOLA!!!!! Even though I really didnt need to change the aux fan (which couldve save me 250.00 beer money) I still feel as tho I made out vs the 680.) Lesson learned, start from sensor then work your way to the actual part you will save more money using that strategy.

    Quote Originally Posted by BimmerGoon View Post
    whats the difficulty on this? I'm a beginner and I think this will need done soon to my car, BUT if its difficult then I may just go to a shop. Any ideas on how much this would cost at a shop?

    It took me a couple of hours because it was my first time... but all you have to do is get the dang bumper off and drop the aux fan and you should be good to go......but before you do that (as I have mentioned before) check your coolant temp. sensor
    Last edited by Smookey525i; 06-16-2010 at 11:14 AM. Reason: Automerged Doublepost

  17. #42
    Join Date
    Apr 2005
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    Baltimore, MD
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    Blown 530
    Damn what made him think it was the fan? A basic electrical test would have let him know weather it was working or not

  18. #43
    Join Date
    Jun 2010
    Location
    Laurel, Maryland
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    12
    My Cars
    2003 BMW 525i sedan

    Lightbulb

    Quote Originally Posted by Jackcat559 View Post
    Damn what made him think it was the fan? A basic electrical test would have let him know weather it was working or not

    Welllllll the problem was in my case that the b*tch would not shut off and made a god forsaken LOUD noise constantly from the moment the car got a little warm till I shut it down (in this case it sounded like I was shutting an aircraft down). So he figure it was the modulator which controls the speed and if it should be on and off..... If I'm correct the modulator that sits in the back of the fan recieves information from the coolant temp sensor...Sooooooooo if the sensor is jacked up then guess what.... The frickin aux fan will keep on going thinking that it needs to be on *based off the info from the coolant temp sensor.

  19. #44
    Join Date
    Apr 2005
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    Baltimore, MD
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    Blown 530
    gotcha

  20. #45
    Join Date
    Jul 2004
    Location
    Charlotte/Raleigh, NC
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    1,068
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    94 325is, 98 528i
    seems as though this fan motor is no longer in production, the part that has replaced it (manf. by four seasons) is $180. I may just go ahead and get whole shroud assembly from dealer, ugh.
    M50 3.1L Stroker - TC Kline D/A

  21. #46
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    Nov 2009
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    bm
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    err
    Parts bin has it for 184.74 and a 1 year warranty.http://www.thepartsbin.com/catalog/?...367+4294952362

  22. #47
    Join Date
    Jul 2004
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    Charlotte/Raleigh, NC
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    94 325is, 98 528i
    Just got the depo fan in from ebay, its not OEM quality but will work fine.
    M50 3.1L Stroker - TC Kline D/A

  23. #48
    Join Date
    Apr 2009
    Location
    UP (yours), MD
    Posts
    4
    My Cars
    2001 540i & 1989 240
    Can anyone here help me out. I hav a 01 540i, aux fan less than a year old... My fan seems to operate only on hi mode, as a result my temp goes up constantly to near danger levels... Any one that give a little insight greatly apreciated

  24. #49
    Join Date
    Feb 2010
    Location
    Henderson, NV
    Posts
    97
    My Cars
    2008 535i
    Here in Vegas I've had plenty of occasions to heard the aux fan on high. I thought it was bad because it was so loud but now that I see what it looks like, it's no wonder it's loud.

  25. #50
    Join Date
    Oct 2009
    Location
    Murfreesboro, TN
    Posts
    13
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    528iT, 951
    Just an FYI for those of you in need of a new fan. Mine exploded and forced me to buy an entire assembly. I called a friend at LKQ which is a nationwide salvage yard. He sold me an entire aftermarket assembly for 150 bucks. Bolted right in and plugged in!!!!!! All new and works perfectly.

    On a side note those of you removing the bumper for the first time. I would highly recommend just leaving the bumper cover attached to the bumper and simply removing the fog light covers, 4 bolts attaching the air ducts, inner fender bolts, and the bumper shock mounting bolts (6 big ones, 4 small ones). It all comes off together and you don't have to worry about breaking all the bumper cover clips. Just my opinion.

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