Strange climate control
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Member
Joined: Aug 2012
Posts: 209
Likes: 36
2025 GLE450
Strange climate control
My 2013 ML550. Climate control set on "auto" just started being noisy (air flow noise, not mechanical noise). Switching out of auto reveals it's using floor vents, face vents, and defroster vents on auto. If I manually select just floor or face vents (or both), it's quiet. Any idea why it would start using the defroster vents on auto?
Member
Joined: Oct 2012
Posts: 94
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S550, SRX, ML550
Did you get the extra option for rear seat climate control? I noticed mine included a mysterious "mist sensor" as part of that package (581), which I'm guessing can automatically detect that the window has fogged up and turn on the defroster.
I haven't had a chance to see if it works though - Colorado is a pretty dry climate and my ML parks in a garage, so I never really have an issue with misted over windows that occurs quite frequently elsewhere.
I haven't had a chance to see if it works though - Colorado is a pretty dry climate and my ML parks in a garage, so I never really have an issue with misted over windows that occurs quite frequently elsewhere.
Last edited by Thimee; Jan 11, 2013 at 02:29 PM.
Super Member
Joined: Jul 2010
Posts: 625
Likes: 4
From: Australia
X350d GLE500e 2017, ML350 BlueTec 2012(sold), A200 2013, ML350CDI 2009(sold), Aston Martin DB7 2003
You've got a big car, and when it starts up, the sensors say you've got to replace all the air with fresh heated or cooled air. To do that it goes to full fan speed regardless of the setting. After a while as things stabilise, it will settle down to a moderate speed and you are comfortable.
The ML is no where near as noisy as some cars. Ear muffs are required in the Range Rover.
Regardless I usually reduce the fan speed which turns off the auto, and it all works fine albiet one minute later.
The ML is no where near as noisy as some cars. Ear muffs are required in the Range Rover.
Regardless I usually reduce the fan speed which turns off the auto, and it all works fine albiet one minute later.
Super Member
Joined: Mar 2011
Posts: 552
Likes: 1
From: Near Niagara Falls, Canada
2013 ML BLUETEC JULY 31
We are assuming the 3 airflow locations because that's what displays first. I wouldn't say that's my experience. I have never had the fans speed start in high even when the temp setting is full high or low. Each country surely has different systems of the same general layout. The electric heat in Canada sure is welcome. Not sure if Northern US can get it.
Junior Member
Joined: Dec 2010
Posts: 50
Likes: 2
From: Castle Rock, CO
2021 GLE AMG 63S, 2022 GLC, and 2013 ML350 4Matic
Did you figure out what the problem was? I have a noise that is loud when the heater is blowing hard and the A/C button is on (it comes on when I use the 'auto' feature). When I turn off the a/c feature, it stops immediately and starts again when you turn the a/c feature on. I remember reading a post saying the fans aren't syncronized, but I can't find it now.
