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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 01-12-2013, 08:16 AM
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BigCo540i BigCo540i is offline
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Fan clutch kaput?

With the engine running at operating temperature, I can stop the fan with 1 finger and spin it backwards would you say that the fan clutch isn't working?
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  #2  
Old 01-12-2013, 08:20 AM
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E36 Phantom E36 Phantom is offline
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Nope. It only engages when the car is struggling to maintain operating temperature.

Go drive hard for a bit and pop the hood, try stoping the fan immediately, after one minute, and 3 minutes. Should engage at least at one of those points. But, use a thin newspaper roll, not your finger.

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Old 01-12-2013, 09:09 AM
Mikes530 Mikes530 is offline
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Originally Posted by E36 Phantom View Post
But, use a thin newspaper roll, not your finger.
+1 VERY important unless you enjoy a trip to the hospital. The fan employs a fluid coupling that progressively engages the fan based on engine temperature.
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Old 01-12-2013, 05:24 PM
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BigCo540i BigCo540i is offline
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Coolant temp was 3\4 to red and getting hotter and i could still stop the fan and spin it backwards with the engine running. No way this is normal for a fan clutch.
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Old 01-12-2013, 07:04 PM
AV8R4AA AV8R4AA is offline
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Get new clutch and new prop blade.
You got your monies worth .....
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Old 01-12-2013, 10:32 PM
Mikes530 Mikes530 is offline
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Originally Posted by BigCo540i View Post
Coolant temp was 3\4 to red and getting hotter and i could still stop the fan and spin it backwards with the engine running.
Sure sounds as if it's seen better days. Did your aux fan kick in, it should have at 3/4 on the coolant temp.
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Old 01-14-2013, 01:27 PM
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BigCo540i BigCo540i is offline
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No, my aux fan is on my repair list as well.

I went ahead and ordered a new fan clutch with a lifetime warranty from autozone.
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Old 01-14-2013, 01:54 PM
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Quote:
Originally Posted by BigCo540i View Post
With the engine running at operating temperature, I can stop the fan with 1 finger and spin it backwards
Quote:
Originally Posted by BigCo540i View Post
Coolant temp was 3\4 to red and getting hotter and i could still stop the fan and spin it backwards with the engine running.


Those are very different things.

Yes, the fan clutch is bad. As in my first post, it should only engage if the engine is struggling to maintain op temp. If you were idling at op temp it shouldn't be on in winter in most cases. If the temp was at 3/4, hell yeah it should be engaged.

3/4+ is NOT op temp.

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Old 01-17-2013, 06:47 PM
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BigCo540i BigCo540i is offline
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Fan clutch it was. The one from autozone was packaged as Turflo but the part was actually a Behr.
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Old 01-17-2013, 07:23 PM
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I have a simpler way of doing this.
With engine hot, place your hand behind the fan, if it blows well (like your living room standing fan at home @ medium speed), then it is fine.
Or hold a piece of paper behind the fan (between the fan and engine), if the paper flaps, then fan is good.

Sorry not to be scientific!
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