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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 08-27-2010, 12:16 PM
aioros aioros is offline
aioros
Location: Wildomar, CA
 
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Mein Auto: '99 528i auto , '01 330xi
aux. fan not working

my aux fan is not working nor turning on when the a/c is on. I replaced the fan switch that goes in the lower hose attached to the rad when I did the cooling system overhaul.
what else could it be the cause?


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  #2  
Old 08-27-2010, 12:42 PM
cn90 cn90 is offline
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1. Check the Fuse
2. Check the Aux Fan itself.
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  #3  
Old 08-27-2010, 12:49 PM
aioros aioros is offline
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how do you check the fan?


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  #4  
Old 08-27-2010, 01:26 PM
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dannyc9997 dannyc9997 is offline
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Quote:
Originally Posted by aioros View Post
how do you check the fan?


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Manually spin it through the grill, if it is very tough to move it has locked up and needs replacing. If its moving free, try to directly power it up.
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  #5  
Old 08-27-2010, 03:10 PM
aioros aioros is offline
aioros
Location: Wildomar, CA
 
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how do i directly power it up?
I made it spin, it's not hard to move it. I checked the fuses...well sort of. Of all the fuses that apply to the aux. fan I could only check #20 (7, 20, 22, 75) #7 and #22 don't have fuses but I coud not find #75.
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  #6  
Old 08-27-2010, 03:21 PM
aioros aioros is offline
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i just read this thread about fuse 75 and the heater blower not stop blowing after the car is shut off http://www.bimmerfest.com/forums/sho...hlight=fuse+75.
my problem is the aux. fan, the one in front of the rad. I will try to find fuse 75 in the back of the glove box like the other thread said it was.
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  #7  
Old 08-27-2010, 03:25 PM
zybanuser zybanuser is offline
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You'll find it on this thread: You don't have to remove the glove box. Just slide the black panel underneath, crawl under then look up and you'll see it.

http://forums.bimmerforums.com/forum...d.php?t=748011

I followed every step and removal/installation was a breeze. Although I had to make a quick run to autozone to get a T-45 torx bit.
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  #8  
Old 08-27-2010, 03:28 PM
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kbnn_ kbnn_ is offline
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my aux fan is not working more than a year
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  #9  
Old 08-27-2010, 03:51 PM
aioros aioros is offline
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thanks zybanuser that diy writeup is excellent. if all fails thats what i need to do.
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  #10  
Old 08-27-2010, 04:16 PM
aioros aioros is offline
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here you are the fuses, they are ok. the 40amp (orange) is the closest to the passenger seat.
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  #11  
Old 08-27-2010, 04:18 PM
aioros aioros is offline
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oops, here are the pics:
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  #12  
Old 08-27-2010, 04:41 PM
schardbody schardbody is offline
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does anybody know what wires are what in the connector? i have the same problem and found the connector, didnt have time to check for power to the fan, but i'll do that tomorrow, i'd like to know which wires are what though incase i need to hot wire it to check the motor.....
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  #13  
Old 08-27-2010, 05:53 PM
aioros aioros is offline
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Location: Wildomar, CA
 
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how do you power up the fan to check the motor?
how do you find out if your aux. fan has a resistor?
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  #14  
Old 08-27-2010, 06:00 PM
zybanuser zybanuser is offline
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http://forums.bimmerforums.com/forum...d.php?t=605750
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  #15  
Old 08-27-2010, 07:04 PM
aioros aioros is offline
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aaaahhh I love this forum!!! it never ceases to amaze me. no need to buy the whole aux. fan and spend $300+ dllrs. you can change the motor for about $90. thanks a lot.
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  #16  
Old 08-27-2010, 08:40 PM
cn90 cn90 is offline
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Quote:
Originally Posted by aioros View Post
aaaahhh I love this forum!!! it never ceases to amaze me. no need to buy the whole aux. fan and spend $300+ dllrs. you can change the motor for about $90. thanks a lot.
Don't get excited too soon! That DIY by "PENER" on bimmerforums is for 1997-98 models.

Your 1999 model has a different setup. Search for info. Very often the whole assembly has to be replaced. But again check to be sure that the Aux Fan is the culprit.
The 1999 Aux Fan is pricy though, about $320-350 range or so. Check realoem.com for PN.

Last edited by cn90; 08-27-2010 at 08:41 PM.
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  #17  
Old 08-27-2010, 09:43 PM
aioros aioros is offline
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i haven't been able to locate the fan motor by itself. i went to autozone and they don't carry the siemens motor anymore. I've searched online but nothing yet.
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  #18  
Old 08-27-2010, 10:00 PM
aioros aioros is offline
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Location: Wildomar, CA
 
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this is the cheapest fan I can find:
http://cgi.ebay.com/ebaymotors/BMW-A...Q5fAccessories

FCP Groton sells one for a few more dollars but lifetime warranty.
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  #19  
Old 08-28-2010, 05:55 AM
cn90 cn90 is offline
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Use OEM only.
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  #20  
Old 08-28-2010, 11:56 AM
Jim Rolando Jim Rolando is offline
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Here is my two bits worth. The aux fan on my 99 528 came on nearly all of the time when I first bought my car and I just thought this might be normal. As it ultimately turned out the reason it was coming on all of the time was that it was defaulting to the radiator temp sensor. But, when I overhauled my cooling system I found that the sensor on the bottom radiator hose was unplugged. So, I plugged it in and then the fan would not come on at all. I replaced the sensor with a new one and still no fan; no matter how warm the engine got or how high the pressure in the AC. After driving myself nuts in every way trying to figure it out, I finally took it to a high quality indy shop. They hooked it up to their super scanner and got a message that an aux fan code was missing in the control module. They disconnected the battery for ten minutes, reset the codes and now the fan works just fine.
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  #21  
Old 08-28-2010, 06:54 PM
schardbody schardbody is offline
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tested mine today, Brown wire grounded, and blue wire 12v+ nothing. so i'll be doing a bumper removal soon, GRRRR.....
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  #22  
Old 08-29-2010, 08:14 AM
aioros aioros is offline
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I'll be removing mine too pretty soon, a new aux. fan is on it's way here.
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  #23  
Old 08-29-2010, 09:33 AM
schardbody schardbody is offline
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from what i can see alot of people have had good luck reviving their non working fan motor just by cleaning it out. i'm going to give that a shot. i have the old resistor style 4 plug fan, so i can get a replacement motor for pretty cheap if it doesnt work out.
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  #24  
Old 08-29-2010, 12:08 PM
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DHoang DHoang is offline
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Quote:
Originally Posted by cn90 View Post
Use OEM only.
I concur!
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  #25  
Old 09-06-2010, 01:25 PM
aioros aioros is offline
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Location: Wildomar, CA
 
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Mein Auto: '99 528i auto , '01 330xi
UPDATE:
I installed the new bmw aux. fan (oem) and my a/c is working good again and blowing cold air. I made sure the new fan turns on before putting everything back together.
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