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Old 01-16-2020, 05:12 PM
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Rear center vents not working

Trying to figure out why I don't have any air out of the center vents on the back of the console. If I close off all the dash vents, I can feel some air but not much. Switch to floor and that works fine coming beneath the seats. Is there a door flap in the center console or does it go straight thru to the plenum? BTW, Yes, the rear vent is in the open position. I don't have the optional rear HVAC system, just the 2 vents with the cigarette lighter below it.
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Old 01-16-2020, 10:56 PM
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Not to dispute that you have the rear vents open...but over the decades I've heard owners say that lots of times. But if pressed further as to if they mean by open that that the dial that opens/closes the vents is in the 0 or | position...and they reply that the dial is in the 0 position...which means the vent is CLOSED.

Also make sure that the air distribution button on the IHKA control panel is set for the dash vents. If it is on AUTO/floor/defrost...then the air coming from the rear center vents will be lessened
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Old 01-17-2020, 06:04 AM
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Yes it's in the open position. I've closed & opened them to make sure the flaps work. I've got it set to vent only & blower on high. As I mentioned, if I close all front vents & can get some airflow to the back but not much. Was wondering if the ductwork got separated somewhere in the center console or if there's another blend door in it. Didn't want to rip apart the center console just to investigate.
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Old 01-17-2020, 06:32 AM
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I have uploaded the BMW IHKA HVAC technical description (particularly for the E70) quite a few times. IIRC it is 70 pages long, discusses components, operation, in some detail and might eliminate some misunderstandings and false trails.
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Old 01-17-2020, 07:50 AM
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I just looked thru that and it appears there's an actuator motor that runs the rear vents. Let the fun begin....
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Old 01-17-2020, 07:54 AM
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Quote:
Originally Posted by Not1Clue View Post
I just looked thru that and it appears there's an actuator motor that runs the rear vents. Let the fun begin....
They are all individually addressed, so if you know how to query then you can verify proper operation noninvasively.

I don’t know how.
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Scepticism and Animal Faith (1923)
Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
(The Works of George Santayana p. 65)

Eschew eristical argumentation. I am responsible for what I write, not for your understanding of it.
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Old 01-17-2020, 07:56 AM
deroy deroy is offline
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Quote:
Originally Posted by Not1Clue View Post
I just looked thru that and it appears there's an actuator motor that runs the rear vents. Let the fun begin....


Sure the one u see is not a stratified air flap? Iirc that is the only flap for the rear vents; one, or two for left and right if you have two hot/cold dials in the back.


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Old 01-17-2020, 07:59 AM
deroy deroy is offline
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Rear center vents not working

Quote:
Originally Posted by Doug Huffman View Post
They are all individually addressed, so if you know how to query then you can verify proper operation noninvasively.



I don’t know how.


The simple diy “how” is by carefully listening when changing vent settings manually in idrive. You can hear the flaps operating. Anomalies will stand out. This is best done with engine off, ignition on (press start without touching the brake pedal) and fan on lowest, to minimise other noises.


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Last edited by deroy; 01-17-2020 at 08:01 AM.
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Old 01-19-2020, 04:18 PM
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Not1Clue Not1Clue is offline
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Well I decided to rip it apart
Obviously someone was in here at some point because while taking it apart I noticed there were missing screws, a cross threaded bolt, and a 2" long machine screw that sure looked out of place compared to everything else. Once I removed the glove box, it was plain as day that whoever had this apart placed the ductwork beneath that plastic plate. I just slid the entire console back enough to get that ductwork in the proper location. Turned the ignition on and made sure there was airflow before I start putting it back together. Success!
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Old 01-19-2020, 08:57 PM
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Sometimes exploring is what you need to do. Good job.
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