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Discussion Starter #1
Hey gents and ladies.

Do you have the same issue as me? anyone sitting in my 730 Li feels dizzy and then they want to throw up, specially passengers at the back seats. But the moment I lower windows, they feel comfortable.

How can I lower that air-tightness in my car?

I have already tried letting outside air coming in through ventilation system but that doesnt help unless I open windows.
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 99K miles NOKIAN WR G3 12K miles
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17,582 Posts
Your BMW is not slightly air tight. If you are old then you may remember the earliest VW***8217;s that would ***8216;pop***8217; your ears on shutting a door - and float.

Like an airliner your BMW has two large vents built into the rear somewhere. I***8217;m not familiar with your platform but I am familiar with BMW engineering. The air inlet can be controlled, but the two (or more) vents are fixed.

Your inlet vents should ALWAYS be open and in automatic, but if not in automatic, then open.
 

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Discussion Starter #3
Appreciate the response.

>Like an airliner your BMW has two large vents built into the rear somewhere
Two below in the middle where USB port is between front seats and other two at the top left/right side of the cabin where those big white night-lights are.

So basically you are saying if I let those inlet vents at front and back open this should never happen?
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 99K miles NOKIAN WR G3 12K miles
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17,582 Posts
Not at all. I am suggesting a misguided association.

These are the vents to which I am referring, I believe (based on my guess of your precise platform)

64 22 9 176 945
Rear ventilation

From:11/01/2011To:-Weight:0.100 kgPrice:
Part 64229176945 was found on the following vehicles:
[ ... ]
7' G11 ***8195; (10/2014 - 09/2018)
7' G12 ***8195; (10/2014 - 09/2018)
X3 G01 ***8195; (09/2016 - 09/2018)
X3 G08 ***8195; (01/2017 - 08/2018)
X4 G02 ***8195; (03/2017 - 09/2018)
X5 G05 ***8195; (09/2017 - 08/2018)

Quite similar to mine in size, location and function.
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 99K miles NOKIAN WR G3 12K miles
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17,582 Posts
AUC (or equivalent) should be in AUTOMATIC, unless you don***8217;t trust it, then Manual open to be shut when your nose detects odors.
 

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Your post reports a problem with a 2017 BMW - though "new" is it possible there is an exhaust leak that is causing your (rear-seat) passengers to feel sick? Automobile interior plastics etc also emit vapors - especially when cars are "new". Those odors should be readily detected.
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 99K miles NOKIAN WR G3 12K miles
Joined
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17,582 Posts
Your post reports a problem with a 2017 BMW - though "new" is it possible there is an exhaust leak that is causing your (rear-seat) passengers to feel sick? Automobile interior plastics etc also emit vapors - especially when cars are "new". Those odors should be readily detected.
Volatile plasticizers should be diluted and flushed by the proper fresh air vent arrangement.

The cabin air inlet is near the front of the vehicle, up airflow stream of the hypothetical leaking exhaust system, AND the properly functioning AUC is intended to detect hydrocarbon exhaust fumes and shut automatically.

The sickness from exhaust fumes is carbon monoxide poisoning. Pause while I refresh my memory of the biological half-life ... 320 minutes to reduce CO concentration in the blood to one-half on normal air. 80 minutes on oxygen. Carbon monoxide poisioning causes bright-red, ***8216;cherry***8217; red, lips and nail beds.
 
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