2004 E39 530d - Aux Fan not working(FIXED)

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  1. 2004 E39 530d - Aux Fan not working(FIXED) 
    #1
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    E39-Touring's Car Details
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    Hi there,

    The front AUX fan does not work at all on my late 2004 530D touring.

    There is a plug/socket between the o/s front headight and kidney grill , which I assume is the fan feed with two thick wires and one thin wire. Measured 12volts on the thick wires and thats about it, no joy.

    Any help or information would be very much appreciated.
     
     

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    First off, does the fan spin by hand? they are known to seize.

    Otherwise it may well be the high speed and low speed relays IIRC. Will see what I can dig up for you 2mrw.
     
     

  4. 2004 530d aux fan not working 
    #3
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    Hi Ronnie,

    The fan can be rotated and is free.

    There is +12v on the fan supply connector when measured with a dvm and there is a PWM signal present on the control wire (thin black wire) when i put my scope probe onto it.

    In view of this, if the fan supply is there and the pwm signal is present then may i assume that the electronics within the fan are u/s ?

    A quick test using a variable speed computer cooling fan ( the type with 4 wires) has indicated that the fan starts up and changes speed to some extent.

    The burning question is can the pwm fan motor be purchased on its own ?

    Hope that this additional info helps all members and would be glad to receive any further info or help before spending a shed load of hard earned cash on the fan motor.
     
     

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  7. Re 2004 530D aux fan problems 
    #5
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    Hi Ronnie,

    I found this link which highlights the problem and provides a fix.

    http://www.justanswer.com/questions/...-e39-2000-2-8i

    Hope that it is of use to all forum members as it was for me.

    The fan assembly is available new on ebay for £159.00 + p&p


    Any comments are always welcome and appreciated.
     
     

  8. The Following User Says Thank You to E39-Touring For This Useful Post:

    Ronnie (07-07-2009)

  9. Re 2004 E39 530D touring aux fan 
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    Hi Ronnie,

    An update on the ebay aux fan.

    They only offer 3 months warranty on a new fan.............. Not worth the risk.

    Looks like I will have to get the fan (64546921396) from the BMW main dealer at £271.48 inc V.A.T.

    Stripped the old fan out this afternoon, not much can be done with it.
    Not a very good advertisment for a world famous company Siemens, who make the fan. When you actually look at the fan and the mounting/flaps/etc then you know why this is a high value item. The motor should be sold as a seperate item but unfortunatly this type of motor it is not.

    On the positive side, you save a shed load of hard earned cash by doing the job yourself and have the satisfaction that the job has been done correctly. You also have to have diagnostic gear to clear the fan fault memory. Peake Research R5/FCX3 does the job.

    Hope that this helps forum members. Wonder how many 530D's are out there with the owners not aware that the aux fan is not working ?
     
     

  10. The Following User Says Thank You to E39-Touring For This Useful Post:

    Ronnie (07-07-2009)

  11. Post mortem 530D touring aux fan motor 
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    With reference to the Aux Fan problems on my 2004 E39 530D Touring.

    To rectify the problem a new fan unit was ordered from the main dealer.
    New unit installed and fault memory cleared using R5/FCX3 tool.

    I decided to do a post mortem on the faulty motor.

    My findings are as follows :

    (1) Spade terminals corroded on motor control board.
    (2) Spade connectors on motor field windings corroded.
    (3) Burnt out field coil output transistor.

    Cleaning up the corroded connectors and lubricating with contact cleaner did not rectify the problem. Motor was still dead. All field winding continuity was found to be o.k. A close inspection of the motor control board revealed that one of the field coil output transistors had partialy lifted from the circuit board. This was due to the transistor going short circuit which generated a lot of heat and burnt a hole in its case. This heat had also melted the solder which attached the transistors metal tab to the supply line. The supply fuse should have blown but it did not, probably due to the output transistor destroying itself in a very short time and no longer making contact with the +tive supply line.

    I have attached a photo to highlight the area concerned.

    Hope that this info was useful to all members
    Attached Images
    Last edited by E39-Touring; 18-07-2009 at 21:24.
     
     

  12. The Following 3 Users Say Thank You to E39-Touring For This Useful Post:

    gildersol (18-07-2009),Ronnie (18-07-2009),stevesr (21-06-2010)

  13.  
    #8
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    Alpejohn's Car Details
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    Hi,

    I know this is an old thread, but i have some problems with my aux fan on my 03 530d too!

    My fan works, but not on the lowest speed, when i turn on the AC, the fan "tries" to start, but end up making squik noice, and moves 1 cm forward and back until it kicks in at much faster speed. When the ac is on, the fan goes in and out every 15 sec or so at a faster speed and alot of noice.

    I also checked with DIS, and ran a test on the fan, when i press activate, nothing happends, just some squick noise and a little movement, and after 5-6 sec the fan starts, and from there, it only goes faster and faster until it reaches fastest speed, and then it stops.

    I was hoping to find only the motor, and not buy a complete fan, but you said that is not possible for this fan? (I also have the PN ending with 396 on the fan).

    You wouldnt happend to have the old motor so you can check the number on it? If not i need to remove my fan and take a look

    Best Regards
    Fredrik Sandvik
    Norway
     
     

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