GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

roof ventilation/ air vents question

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Old 12-29-2009, 03:48 AM
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roof ventilation/ air vents question

A question about the airvents on the roof, 2nd/3rd passenger seat area.

How much air comes out of these vents? I've tried setting the fan to the highest on the rear console but no air seems to come out of the vents on the roof.
I've pressed the button with the seating arrow facing up on the console, but still cant feel any air or whatsoever.

Thanks in advance
Old 12-29-2009, 10:24 AM
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2009 GL550
are you blowing heat or cold A/C? It seems to me that heat comes underneath the 2nd row floorboard, while cold air/Air Conditioning does come through the vents. Make sure the vents are adjusted with the knobs to be "on" (i.e. airflow not restricted)...
Old 12-30-2009, 12:45 AM
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Cold air and the knobs are dialled to the max on position, but I just don't feel any airflow coming from them.
Old 12-30-2009, 09:49 AM
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weird - I definitely noticed cold air coming from my rear roof vents.

You might try, since there are two vents on each side and on the back, turning the dial that controls the individual vents airflow so that only 1 of the 2 vents on each side and on the back is blowing air while the other is completely off. If the air is only forced through three vents instead of six it might be stronger - but yes, you should feel air come out.

Make sure the knob on the back of the front seat console is dialed to max cold as well (the one that the 2nd row passengers would adjust the temp with). Sorry if I'm putting out elementary advice, just want to cover all the bases.
Old 01-26-2010, 10:36 PM
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turns out that the roof vents were set to fault on the computer. Had the MB tech fix that, ahhhhhh air!!!!

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