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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 07-01-2015, 02:55 AM
miha miha is offline
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Location: croatia
 
Join Date: Jun 2015
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Mein Auto: e39 530d
99 e39 auxiliary fan

I'm having some problems whit the ac fan or auxiliary fan on front of the radiator....
The old fan has burned out so I found a replacement one but it doesn't work again... there is no voltage on the conector!! I've checked all the fuses, including the fuse under the glove box and they are ok....then I found another fuse that is in the trunk, 100 Amp fuse, he was blown up, I replaced it whit another fuse and the fan turn on but it wont stop spinning even when the car is turn off. After a while that 100 A fuse blow up again and I don't have any idea what to do!

The AC is working fine and cooling while driving....

Can someone help me whit my problem or had similar problem

I assumed that maybe it was some power wire that may be damaged, but then the 100 A fuse would blow up immediately, not hold some time then blow up....

Last edited by miha; 07-01-2015 at 02:58 AM.
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  #2  
Old 07-04-2015, 07:16 AM
miha miha is offline
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Mein Auto: e39 530d
Anyone?
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  #3  
Old 07-04-2015, 08:08 AM
ca2014mp2 ca2014mp2 is online now
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Location: San Jose
 
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Mein Auto: E39 528ITA
Ok help me out just a little.. You're aux fax should be like mine that is PWM. You should have 3 wires up front. I 'think' it was 98 that this new system switched from the resister pack system to this new pwm system that the dme handles the fan. At the lower output of your radiator is a temp sensor on our systems if that is failed it will spin the aux fan to HIGH as a way to protect the system in case of failure. I use this as my number one test to prove if the aux fax is faulty or not. PMW is tricky to prove the fan works because you need have a wave form pattern that is not easily generated to prove the fan works. This is where I would start to get the system back up and running. Lastly, 100a fuse blown is as serious short. You also can't rule out good wiring. You must check the wiring from that fuse on out to the fan..
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Series E39 Vehicle code DP63 Model 528ITA Engine M52TU
Body type OTHER Catalog model USA Production date 1999 / 06
Transmission Automatic Steering Left Catalyzer YES

Production FROM : 1998/09/01 TO : 1999/08/31

Last edited by ca2014mp2; 07-04-2015 at 08:10 AM.
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  #4  
Old 07-06-2015, 03:08 PM
miha miha is offline
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I've done some research and found out thet on the fan power line is also glow plug relay, maybe is that the relay is shorted out and he blows up the 100a fuse....again the fuse desnt blow up immediately, it holds for a while then he blows up
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  #5  
Old 07-06-2015, 03:46 PM
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DHoang DHoang is offline
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Location: Austin, Texas
 
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Mein Auto: '98 528i, '82 323i
Quote:
Originally Posted by ca2014mp2 View Post
I 'think' it was 98 that this new system switched from the resister pack system to this new pwm system that the dme handles the fan.
Not the '98 year, but the 1999 model year is when the system switched tothe new pwm...
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  #6  
Old 07-06-2015, 03:50 PM
ca2014mp2 ca2014mp2 is online now
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Ok great... wasn't there a month too. like 5,6 of 99??
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Series E39 Vehicle code DP63 Model 528ITA Engine M52TU
Body type OTHER Catalog model USA Production date 1999 / 06
Transmission Automatic Steering Left Catalyzer YES

Production FROM : 1998/09/01 TO : 1999/08/31
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