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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 01-30-2013, 10:29 AM
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doru doru is offline
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Another FSU?

I am chasing some electrical problems, and in doing so I stumbled upon a 2nd FSU that apparently is equipping our cars. It's the rear vent FSU, Item #2 in the diagram below (p/n 64118369561). I wonder if this one goes also bad, and starts drawing power like the front one?

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  #2  
Old 01-30-2013, 10:34 AM
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Fudman Fudman is offline
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Good question! Never seen nor ever heard of this one before.
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  #3  
Old 01-30-2013, 10:37 AM
edjack edjack is online now
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Certainly possible. Disconnect it and observe the results.

The early cars only used the vent for A/C; the later cars had a mixing wheel on the vent, and an aux blower for the back seat.
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  #4  
Old 01-30-2013, 12:07 PM
jygesq jygesq is offline
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the listing refers to cars with rear air conditioning . I do not think our cars are such, probably why we have not heard of Rear FSU problems.
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  #5  
Old 01-30-2013, 12:37 PM
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doru doru is offline
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Quote:
Originally Posted by jygesq View Post
the listing refers to cars with rear air conditioning . I do not think our cars are such, probably why we have not heard of Rear FSU problems.
What does rear air conditioning mean?

I searched realoem by typing in my VIN. The rear vent on mine has the 2 dials. One for warm/cold, the other one open/closed. I think the rear temperature is set by the front HVAC panel.

Having rear air conditioning means there is a rear HVAC panel? I haven't seen one in realoem. And, on the same realoem page I haven't seen that FSU as optional, but standard.
And if we have that FSU, how the heck does it work?
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  #6  
Old 01-30-2013, 01:38 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by doru View Post
What does rear air conditioning mean?
I had posted to this thread a long time ago but it's not really about the ac or the rear FSU but has pictures of the vent (but not the FSU).
> E39 (1997 - 2003) > Rearseat A/C vent
Attached Thumbnails
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ID:	359881   Click image for larger version

Name:	rear_ac_vent.png
Views:	22
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ID:	359882  
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #7  
Old 01-30-2013, 01:57 PM
pleiades pleiades is offline
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Ha, another arcane section of realoem.com I didn't want to see....

Heater & air conditioner section, under "collective function group".....

It's on my car..... online vendors have it in stock! It is priced higher than the front FSU!

What would be the drawback of just unplugging this thing?
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  #8  
Old 01-30-2013, 04:29 PM
edjack edjack is online now
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The rear blower won't run.
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  #9  
Old 01-30-2013, 07:00 PM
pleiades pleiades is offline
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Quote:
Originally Posted by edjack View Post
The rear blower won't run.
Half-expected it would disable something else and launch a series of strange electrical faults.... As long as this one isn't as prone to failure like the one up front.
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  #10  
Old 01-31-2013, 06:11 AM
jygesq jygesq is offline
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do we really have a rear blower?

Quote:
Originally Posted by edjack View Post
The rear blower won't run.
there is no control for it( if there is one)n rear vents
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