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X5 E53 (1999 - 2006)
The X5 SAV Forum

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  #1  
Old 06-20-2013, 06:05 PM
jc05x5 jc05x5 is offline
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Location: Greensboro, NC
 
Join Date: May 2005
Posts: 108
Mein Auto: 05 X5 / 11 M3 Vert
Aux Fan replaced and no luck....

Son's 2005 x5 3.0 had the aux fan go out. We ordered a new one and installed it tonight.

(while we had the bumper off we replaced the grills that had been damaged - that was easy)...

Back to the fan....

So we turn on the x5, crank the AC wide open, and stare at the fan waiting for it to do it's stuff. Needless to say the fan never started turning.

I tested the wiring harness where the fan plugs in and I am getting 12v-13v so I know it's getting juice.

What am I missing here? next step?

Thanks in advance!
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JC in NC
___________________________________
I've loved em all....

2013 X5 5.0 M (White/Sand) - Ordered
2012 X5 Diesel (Titanium/Oyster) - Wife is loving it

2011 M3 Vert (Alpine/Beige) - Gone
2008 550i (Space Grey/Grey) - Gone
2006 M3 Vert (Imola Red/Imola Red) - Gone

2005 X5 (Grey/Black) - Son driving it now
2005 X5 (Black/Tan) - Died after a week
2005 X5 (Kalahari/Tan) - Gone
2004 M3 Vert (Blue/Grey) - Gone
2002 330ci (Silver/Black) - Gone
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  #2  
Old 06-20-2013, 07:14 PM
528JD's Avatar
528JD 528JD is offline
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Location: North of Ann Arbor, MI
 
Join Date: May 2007
Posts: 858
Mein Auto: '07 X5, '00 528i
What about the FSU?

a/c wasn't working on my e39.
it was a 10 min fix.
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X5 4.8i
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  #3  
Old 06-21-2013, 05:03 AM
jc05x5 jc05x5 is offline
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Location: Greensboro, NC
 
Join Date: May 2005
Posts: 108
Mein Auto: 05 X5 / 11 M3 Vert
Any way to test without having to buy and swap?

I have metered the fan at the unit and it getting power. Would it still get power if the FSU was bad?
__________________
JC in NC
___________________________________
I've loved em all....

2013 X5 5.0 M (White/Sand) - Ordered
2012 X5 Diesel (Titanium/Oyster) - Wife is loving it

2011 M3 Vert (Alpine/Beige) - Gone
2008 550i (Space Grey/Grey) - Gone
2006 M3 Vert (Imola Red/Imola Red) - Gone

2005 X5 (Grey/Black) - Son driving it now
2005 X5 (Black/Tan) - Died after a week
2005 X5 (Kalahari/Tan) - Gone
2004 M3 Vert (Blue/Grey) - Gone
2002 330ci (Silver/Black) - Gone
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  #4  
Old 06-21-2013, 05:09 AM
jc05x5 jc05x5 is offline
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Location: Greensboro, NC
 
Join Date: May 2005
Posts: 108
Mein Auto: 05 X5 / 11 M3 Vert
Actually the more I read I don't think it's the FSU. He is not having issues with the blower at all. The x5 is blowing air as expected, it's just that the fan never spins.

Any information from anyone on a relay for this unit?
__________________
JC in NC
___________________________________
I've loved em all....

2013 X5 5.0 M (White/Sand) - Ordered
2012 X5 Diesel (Titanium/Oyster) - Wife is loving it

2011 M3 Vert (Alpine/Beige) - Gone
2008 550i (Space Grey/Grey) - Gone
2006 M3 Vert (Imola Red/Imola Red) - Gone

2005 X5 (Grey/Black) - Son driving it now
2005 X5 (Black/Tan) - Died after a week
2005 X5 (Kalahari/Tan) - Gone
2004 M3 Vert (Blue/Grey) - Gone
2002 330ci (Silver/Black) - Gone
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  #5  
Old 06-29-2013, 08:16 PM
upallnight upallnight is offline
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Location: Crook County
 
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Mein Auto: BMW, Lotus, Porsche
There are three wires to the aux fan. Two thick wire and a skinny wire. The thick wires are the power and ground. The skinny wire is the control wire for the fan. The computer (DME) sends a signal via the skinny wire to the aux fan which tells it to spin and tells it how fast or how slow to spin. Since you have power at the connector the only reason why the fan is not spinning is it is not receiving a signal to turn on the fan. If you have BMW scanner software such as GT1 you can command the fan to turn on.
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  #6  
Old 06-30-2013, 11:19 AM
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QSilver7 QSilver7 is offline
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Location: Northeast Indiana
 
Join Date: Aug 2008
Posts: 5,620
Mein Auto: 1997 740iL / 2006 X5 4.4
Ditto upallnight...the M54's aux fan is not like the earlier aux fans that come on anytime the AC button is initiated. It receives a PWM signal from the DME/ECU...see the info below:

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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

http://imageshack.com/scaled/grid240/822/e38e532ndsigpic.jpg

Last edited by QSilver7; 06-30-2013 at 11:20 AM.
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  #7  
Old 06-30-2013, 02:11 PM
X5Bob X5Bob is offline
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Location: Utah
 
Join Date: May 2005
Posts: 4
Mein Auto: X5 2005
I'm having the same auxiliary fan problem with my 2005 X5 E53. Saw some good You Tube videos on diagnosing radiator heating problems and applied to my situation to narrow problem down to the fan.
I checked the two AC fuses in the gove box and they both look good.
AC works fine but fan does not come on under any conditions.
Will have to learn how to trouble shoot the relay.
Don't understand why replacement fan is costly and laborious. Cost could be high but seems like plastic shroud comes off easy giving easy access to the fan.Could save money by buying at a salvage shop?
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  #8  
Old 06-30-2013, 03:35 PM
upallnight upallnight is offline
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Location: Crook County
 
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Mein Auto: BMW, Lotus, Porsche
If you ever taken apart an aux fan you will know the reason for the high cost. It uses micro circuitry in addition to the regular fan motor. If you ever replaced an aux fan you will know that the bumper cover and metal bumper needs to be removed in order to replace the aux fan.
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  #9  
Old 07-01-2013, 11:33 AM
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QSilver7 QSilver7 is offline
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Location: Northeast Indiana
 
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Mein Auto: 1997 740iL / 2006 X5 4.4
Quote:
Originally Posted by X5Bob View Post
I'm having the same auxiliary fan problem with my 2005 X5 E53. Saw some good You Tube videos on diagnosing radiator heating problems and applied to my situation to narrow problem down to the fan.
I checked the two AC fuses in the gove box and they both look good.
AC works fine but fan does not come on under any conditions.
Will have to learn how to trouble shoot the relay.
Don't understand why replacement fan is costly and laborious. Cost could be high but seems like plastic shroud comes off easy giving easy access to the fan.Could save money by buying at a salvage shop?
Your aux fan doesn't use a relay. We don't now which model x5 you have, but by 2005, none used the 2 or 3 speed fans that used a relay like in the engines used prior to 9/98 build date. Your 05 x uses a variable speed fan that's controlled by the DME/ECU mentioned in my previous post.
__________________
Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

http://imageshack.com/scaled/grid240/822/e38e532ndsigpic.jpg
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  #10  
Old 08-17-2013, 05:47 PM
ranger2k ranger2k is offline
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Location: Indianapolis, IN
 
Join Date: Oct 2012
Posts: 5
Mein Auto: 2006 X5 3.0
I just did this repair on my 2006 X5 last night. The fan, if you purchase aftermarket, can be had for less that $200. I got mine, including the cowling for $170 shipped. The only issue I had was that even though the cowling looked 100% the same, there was just enough variance that I ended up pulling the NEW fan and putting it in the OLD cowling.

I also popped open the fan to see/compare the controls, they looked almost 100% identical to the BMW part, the was 3 times the cost.

It's now working - finally.

Good luck.
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  #11  
Old 08-17-2013, 05:54 PM
ranger2k ranger2k is offline
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Location: Indianapolis, IN
 
Join Date: Oct 2012
Posts: 5
Mein Auto: 2006 X5 3.0
Actually, you are incorrect on the metal bumper removal (for an E53) the plastic bumper is all that needs to be pulled away from the front of the vehicle. It does not need to come off.

I did the job in about 2 hours last night.

Quote:
Originally Posted by upallnight View Post
If you ever taken apart an aux fan you will know the reason for the high cost. It uses micro circuitry in addition to the regular fan motor. If you ever replaced an aux fan you will know that the bumper cover and metal bumper needs to be removed in order to replace the aux fan.
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  #12  
Old 08-17-2013, 06:38 PM
upallnight upallnight is offline
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Location: Crook County
 
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Mein Auto: BMW, Lotus, Porsche
You have a facelifted X5 my is a pre-faced lifted X5. The metal bumper had to be loosen/removed in order to removed the two shrouds that directed air to the fan. Does your X have shrouds that direct air to the fan?
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  #13  
Old 08-18-2013, 05:34 AM
ranger2k ranger2k is offline
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Location: Indianapolis, IN
 
Join Date: Oct 2012
Posts: 5
Mein Auto: 2006 X5 3.0
Yes, I have the shrouds. One of the P/N is BMW part# 51 71 7 123 350. The two shrouds you speak off are held in place with 2 plastic rivets. I pulled mine out to give me more room. Once the rivets were pulled, after a few twists and turns, they were out. Putting them back in was much easier.

Loosening the radiator (at the top) also allowed a bit more room.

No metal bumpers were removed, that would have been more than I bargained for.

Quote:
Originally Posted by upallnight View Post
You have a facelifted X5 my is a pre-faced lifted X5. The metal bumper had to be loosen/removed in order to removed the two shrouds that directed air to the fan. Does your X have shrouds that direct air to the fan?
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