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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 06-21-2017, 07:14 AM
cvgtpc1 cvgtpc1 is offline
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Mein Auto: 2002 E39, 2008 E70
02 525i - Aux fan not working

Looked through assorted threads and can hopefully receive some clarification without that much grief A couple questions before I tear into it to minimize oh crap moments.

From what I've read it appears the aux fan solution for my model year is replace the fan assy. You can't get away with shorting pins on the connector to determine what resistors or relays to change as previous model years?

Also read the radiator temperature sensor plays a part in turning on the aux fan. My car doesn't overheat so does that mean the sensor is good? Is there a way to test it, or its such a cheap part I should just replace to troubleshoot?

Looked on realoem and every IPB I checked didn't show the aux fan, but must be there somewhere.

Many thanks in advance for any suggestions, tips, or constructive criticism haha
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  #2  
Old 06-21-2017, 08:25 AM
edjack edjack is offline
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Your fan is controlled by the engine computer (aka DME), based on the outlet temperature of the radiator. It is tested when the engine is first started. It will spin momentarily, and the DME monitors the operation. If it does not spin, it is likely bad.

Probably a mite too technical. http://www.bimmerfest.com/forums/sho...d.php?t=853344

Item 5: http://www.realoem.com/bmw/enUS/show...diagId=64_0832
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Last edited by edjack; 06-21-2017 at 08:28 AM.
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Old 06-21-2017, 11:03 AM
cvgtpc1 cvgtpc1 is offline
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Mein Auto: 2002 E39, 2008 E70
Quote:
Originally Posted by edjack View Post
Your fan is controlled by the engine computer (aka DME), based on the outlet temperature of the radiator. It is tested when the engine is first started. It will spin momentarily, and the DME monitors the operation. If it does not spin, it is likely bad.

Probably a mite too technical. http://www.bimmerfest.com/forums/sho...d.php?t=853344

Item 5: http://www.realoem.com/bmw/enUS/show...diagId=64_0832
Thanks edjack.

Yeah a bit too technical. lol

Hmm didn't look at it as an HVAC part but guess it is.

Fan is only $106 on Amazon so will give it a shot.
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Old 06-21-2017, 01:57 PM
edjack edjack is offline
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Did you verify that the fan does not spin when the engine is started?
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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Old 06-21-2017, 01:59 PM
cvgtpc1 cvgtpc1 is offline
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Originally Posted by edjack View Post
Did you verify that the fan does not spin when the engine is started?
Not yet. It's in an airport parking lot now and I won't see it till Friday.
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Old 06-23-2017, 01:16 PM
cvgtpc1 cvgtpc1 is offline
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Originally Posted by edjack View Post
Did you verify that the fan does not spin when the engine is started?
Have verified the fan doesn't move when the engine is started.


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