New car - Super loud HVAC fan
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Joined: Oct 2020
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GLS450
New car - Super loud HVAC fan
Hey all,
I just picked up a 2020 GLS450 over the weekend for the wife. She is very excited. So am I... such a beautiful ride.
BUT - When the AC is on a mid to high airflow setting, it sounds like there is a vacuum cleaner behind the dashboard. It's super loud and annoying. I have an appt for the dealer to fix it, but I'm curious... this cannot be normal, right? Is anyone else experiencing this?
Thanks, and looking forward to learning and contributing on this forum.
I just picked up a 2020 GLS450 over the weekend for the wife. She is very excited. So am I... such a beautiful ride.
BUT - When the AC is on a mid to high airflow setting, it sounds like there is a vacuum cleaner behind the dashboard. It's super loud and annoying. I have an appt for the dealer to fix it, but I'm curious... this cannot be normal, right? Is anyone else experiencing this?
Thanks, and looking forward to learning and contributing on this forum.
Junior Member
Joined: Oct 2019
Posts: 16
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From: USA
2019 E300 Luxury Package 2020 GLS 450
I had the same concern and found that the sound was caused by the 3rd row AC inadvertently being on full blast while the front row AC was set to 3 or 4. It made the same vacuum cleaner sound you are describing. As soon as I turned off the 3rd row AC the sound went away, so I would try that before taking it into the dealer. This worked for my car with 5 zone climate which might be different from a car with 3 or 4 zone, however.
Super Member
Joined: Sep 2015
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From: Chicago area
2015 E400 and 2015 GLK350
I find that sometimes if you have one or more of the vents throttled down to less than full flow output, the vent itself makes more "wind noise." Maybe you're hearing air flow noise, rather than actual blower noise?
Out Of Control!!
Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
More than likely this is a Mercedes "feature". The joke is that Mercedes fan speed settings are
LO
LO
LO
LO
LO
LO
FULL BLAST
However, it's not a joke.
The duct/register whistling is also an MB feature, I have it on the center console rear duct/register of my W166. Never had it on a Ford, BMW, Toyota, Honda or Volkswagen. Only Mercedes.
LO
LO
LO
LO
LO
LO
FULL BLAST
However, it's not a joke.
The duct/register whistling is also an MB feature, I have it on the center console rear duct/register of my W166. Never had it on a Ford, BMW, Toyota, Honda or Volkswagen. Only Mercedes.
Last edited by chassis; Oct 16, 2020 at 12:58 PM.
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From: UAE - Abu Dhabi
E63s amg 2017, GLS 580 2020
It happen to me in the agency they fixed it to me immediately, just press on AC from the touch screen, after that you will see the first row setting press on all setting once after that deselect that vacum fan from front screen after that it will be fine, also don't forget to synchronize so in the sec row if they change they just press synchronize and it will become normal again
Sadly there is no child lock for the sec and third row AC setting only for the notepad
Sadly there is no child lock for the sec and third row AC setting only for the notepad
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Is there some sort of Service Bulletin related to this?
I noticed this too. Even at the lowest fan setting, my aircon blower is loud. Its basically not because it blows a lot of air (because it does not), its just loud.
I even turned off both the 2nd and 3rd row vents, and the sound from the front vents is STILL LOUD.
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GLS450
Is there some sort of Service Bulletin related to this?
I noticed this too. Even at the lowest fan setting, my aircon blower is loud. Its basically not because it blows a lot of air (because it does not), its just loud.
I even turned off both the 2nd and 3rd row vents, and the sound from the front vents is STILL LOUD.
I noticed this too. Even at the lowest fan setting, my aircon blower is loud. Its basically not because it blows a lot of air (because it does not), its just loud.
I even turned off both the 2nd and 3rd row vents, and the sound from the front vents is STILL LOUD.
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GLS450
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