MBWorld.org Forums

Notices
S-Class (W222) 2014-2020

A/C Whistling

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Jun 27, 2025 | 03:13 PM
Share
  #1  
miltownhpt's Avatar
miltownhpt
Thread Starter
Junior Member
5 Year Member
 
Joined: Jun 2019
Posts: 43
Likes: 3
14' S550 4Matic, BMW F10
A/C Whistling
Not sure if anyone has experienced this but when I run the a/c, there is a loud whistling noise coming out. It's stronger from the center dash vents and it's blowing semi-warmish air, not cold even when set to low as 60. Noise happens even when the fan is at 1 to 7 and stays even if select the dash, windshield, or foot vents.
Reply
0
Old Jun 27, 2025 | 06:39 PM
Share
  #2  
James S's Avatar
James S
Senior Member
Liked
Loved
Community Favorite
 
Joined: Mar 2024
Posts: 262
Likes: 108
From: Alien Town Roswell NM
2014 S550
Sounds like a blend door is not functioning.
Reply
0
Old Jun 27, 2025 | 08:19 PM
Share
  #3  
VII's Avatar
VII
Super Member
15 Year Member
Photogenic
Photoriffic
Shutterbug
 
Joined: May 2011
Posts: 972
Likes: 270
From: Fort Worth TX
2020 S560, 2014 SLK55 (Prev. 2016 S65, 2013 SLK350, 2008 CLS63, 2006 E350, 2006 CLS500, 2005 C230K)
Or low on refrigerant.
Reply
0
Old Jun 28, 2025 | 12:33 AM
Share
  #4  
BenzV12's Avatar
BenzV12
MBWorld Fanatic!
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2011
Posts: 4,372
Likes: 945
W212 FL
Which mode are you running the A/C ? AUTO or Manual
Please change the modes and try this way . I don't know if it works but worth trying
Reply
0
Back to Subforum
S-Class (W222)
View Next Unread
Any S550e owners still active? 550e reliability talk

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes, average.
Show Printable Version
Email this Page

Advanced Search

All times are GMT -4. The time now is 06:18 PM.

story-0
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-1
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-2
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-3
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-4
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-5
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-6
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-7
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-8
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-9
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE