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E34 (1989 - 1995)

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  #1  
Old 01-26-2016, 03:29 PM
jbenbenek jbenbenek is offline
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Location: va beach
 
Join Date: Dec 2015
Posts: 19
Mein Auto: 94' 530i v8 5speed
what is this part/functions

curious about a fan in my 530i e34 94
under my passanger side dash behind the glove box there is a plastic cover about 18" long and 2" tall. at the end of it it gets round i popped it off and there ia a small fan that looks like it pulls air from the cabin to the fire wall... any clue what this is
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  #2  
Old 01-26-2016, 04:27 PM
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TheEinstein TheEinstein is offline
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Mein Auto: E34 540i
You are correct, it is drawing air from the cabin. And that air is being blown into the "Control Unit Box." The box under that corner of the hood has the engine and trans control modules, along with a small number of relays.
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1995 E34 540ia
160,000 Miles
VIN# ...GF32404
Hellrot Red

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My Basic Repair History (Edited 1/27/2015)

Ongoing comparison between two E34 540ia's

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  #3  
Old 01-28-2016, 02:33 PM
jbenbenek jbenbenek is offline
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Location: va beach
 
Join Date: Dec 2015
Posts: 19
Mein Auto: 94' 530i v8 5speed
when does this function? and how do you know its working?
what calls it to work
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  #4  
Old 01-28-2016, 02:36 PM
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TheEinstein TheEinstein is offline
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Mein Auto: E34 540i
I'd have to look up the wiring to be sure, but I believe it is simply ignition controlled. It will be spinning, and in some cases making noise due to age.
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1995 E34 540ia
160,000 Miles
VIN# ...GF32404
Hellrot Red

Fuelly

My Basic Repair History (Edited 1/27/2015)

Ongoing comparison between two E34 540ia's

OBC4 Hidden Functions : Link
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  #5  
Old 01-31-2016, 09:17 AM
Mykk Mykk is offline
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Location: Prescott Az
 
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Mein Auto: E34 540i/6
It's the DME/computers cooling fan. There is what looks like a coolant temp sensor that is mounted in the aluminum DME mounting area.
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'95 540i/6. M62 throttlebody, Velocity Stack manifold, Ostrich 2.0 chip emulator/modified DUDMD tune, Bosch gen III injectors, dual 2.25" exhaust.
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