RM European Auto Parts
Results 1 to 5 of 5

Thread: Cooling fan not working no matter what. Please read!

  1. #1
    Join Date
    Aug 2017
    Location
    Denver, CO
    Posts
    2
    My Cars
    e53 X5

    Cooling fan not working no matter what. Please read!

    Hey everyone,

    I've been lurking for quite some time around several BMW forums.. playing with coding, etc. Just as a background, I have 10-15 years of shade tree experience, and my brother has been fixing BMW's on the side for several years, so we sort-of know our heads from our ass I guess.

    Problem: Radiator cooling fan will not kick on. Even tried swapping in new fan, tested fan on an e70 and it fired, so I know it's not the fan.

    Things we have tried: Turning on A/C,Jumping the coolant temp sensor, Tried the different fan obviously, also did our best to run through the fuse box.. The A/C is charged with plenty of freon, and the car just will not turn the fan on.

    I have plenty of tools and a multimeter, we are just stumped and have been searching the internet now for about 2-3 days, troubleshooting through threads and nothing seems to help. If anyone has something to try, PLEASE let us know!

  2. #2
    Join Date
    Aug 2017
    Location
    Denver, CO
    Posts
    2
    My Cars
    e53 X5
    car is manufactured 06/07, so it does not have the relay in trunk

  3. #3
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    12,459
    My Cars
    36 Cylinders
    Have you tried manually activating it with diagnostic tools to check for function?
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  4. #4
    Join Date
    Jun 2002
    Location
    Aberdeen, NC (yes, again)
    Posts
    23,672
    My Cars
    E39M5, E500 4WD
    Yep.....that's where you need to be. There's no "jumping" the fan on a late BMW; they are activated only by pulse width modulation from the DME. The fan already has full time hot and full time ground. There's no testing this without a top of the line BMW specific diag computer.

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  5. #5
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    Yup test the fan with right equipment. Autologic or Ista

Similar Threads

  1. 1987 e30 a/c cooling fan not working
    By algee101 in forum 1983 - 1991 (E30)
    Replies: 12
    Last Post: 08-17-2014, 03:36 PM
  2. Can't get OBC to work no matter what!
    By intakewoes in forum 1988 - 1996 (E34)
    Replies: 4
    Last Post: 02-14-2010, 07:32 PM
  3. 2000 740i aux cooling fan not working
    By jsim308ons in forum 1995 - 2001 (E38)
    Replies: 6
    Last Post: 01-23-2009, 09:51 PM
  4. Aux cooling fan not working
    By SprCpe in forum 1976 - 1989 (E24)
    Replies: 15
    Last Post: 08-15-2008, 05:33 PM
  5. Drivers door will not open no matter what.
    By brakelate in forum General BMW Mechanical Help sponsored by RM European Auto Parts
    Replies: 3
    Last Post: 07-19-2008, 11:07 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •