S320 Interior Steaming up - Page 2 - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #11 of 12 (permalink) Old 11-30-2009, 08:04 AM
BenzWorld Elite
Diesel Benz's Avatar
Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 212.025 & 906.633
Location: Europe
Posts: 10,320
Mentioned: 3 Post(s)
Quoted: 32 Post(s)
Originally Posted by desc5 View Post
(W220) 1999 (UK)
The misting up happens wherther the car is at a stand still i.e parked up with the enging running or while on the move.

There has been no signs of any refrigerant leaks, loss of antifreeze but the smell is like mildew/musty adour.

The vehicle is parked up for long preiods of time due to me working overseas so the point made about water in the HVAC housing could be a valid point!

Out of curiosity how does one identify if/when the system needs regassing!
I'm not familiar with a W220 but there are several ways to figure out if the AC system is low with refrigerant. At some point it would not start (likely indicated by the light on the AC button, assuming the car has one, my 221 does not while the other cars do). You would likely have a test mode where you can read the AC pressure values.

But if the system appears to blow cold air at summer time, it should be fine.

I would consider mildew more of a problem when the car is driven often at warn, humid conditions. More water often collected to the heater core bottom. But a 1999 car could have that issue from normal use. I'm not sure if the heater core in this car leaves more often water to the AC housing than others (there was an issue with some 221 housings that were later on improved).

You could always check the heater core drain pipes (easiest to do at summer on a hot and humid day by checking that water comes out through the drain pipes).

If it sounds, or preferably smells like a mildew issue, you could have the AC system treated and see if that helps (for some time at least).
Diesel Benz is offline  
Sponsored Links
post #12 of 12 (permalink) Old 11-30-2009, 08:52 AM
Outstanding Contributor
keyhole's Avatar
Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Posts: 10,353
Mentioned: 9 Post(s)
Quoted: 343 Post(s)
Originally Posted by desc5 View Post

Out of curiosity how does one identify if/when the system needs regassing!
There is an inspection window on the receiver/dryer, and you check for air bubbles in the refrigerant as it is pumped past the window with the a/c switched on. See the left side drawings in the WIS info below for your engine 112:
Attached Thumbnails
Click image for larger version

Name:	W220 ac1.jpg
Views:	710
Size:	131.1 KB
ID:	276058   Click image for larger version

Name:	W220 ac2.jpg
Views:	166
Size:	105.0 KB
ID:	276059  
keyhole is online now  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode

    Similar Threads
    Topic Author Forum Replies Last Post
    Different EURO S320 USA S320 JAPAN S320??????????????? pelteka W140 S-Class 2 07-20-2009 09:32 PM
    A140 Steaming Rocker Cover and Exhaust CodfishCatfish W168 A-Class 0 05-13-2009 03:39 PM
    windows steaming up ( inside ) vtr W168 A-Class 5 12-31-2006 04:10 AM
    Leather Dry Steaming and Cost Question snowbilt Detailing and Car Care 8 12-11-2006 09:18 AM
    94 S320 Interior Parts Guest (MBNZ) W140 S-Class 3 03-02-2002 03:45 PM

    Posting Rules  
    You may post new threads
    You may post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On


    Title goes here

    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome