S320 Interior Steaming up - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 11-29-2009, 12:56 AM Thread Starter
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S320 Interior Steaming up

For the last few weeks i have been having problems with the A/C where the car steams up and there is a warm damp smell.
The only way to get rid of this is have the motor on full blast with the window open and then maybe after another 20/30 minutes the same problem happens!

I think that i probably need the Air con regassed but just looking for confirmation that this is most likely the problem, if so does anyone know how much it costs to carry out this service!

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post #2 of 12 (permalink) Old 11-29-2009, 01:33 AM
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national chains such as kwik fit advertise regassing for around £30.00 but the aircon on my e320 cdi has not worked since i bought it 9 months ago but it doesnt "steam up". the "normal blowers" work fine,maybe a water leak somewhere??
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post #3 of 12 (permalink) Old 11-29-2009, 01:15 PM
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The only time I ever had the car interior constantly steaming up with condensation was on a car without A/C... I eventually found a small fracture in the heater system 'radiator' which was adding vapour to the inside of the car. So look for a leak.
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post #4 of 12 (permalink) Old 11-29-2009, 01:52 PM
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Any chance that the condensate drain is plugged on your air conditioning system? That would cause dampness.

The heater core on mine sprung a leak just the other day. I smelled antifreeze the moment that the air blew into the car.

As long as you dont smell antifreeze...
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post #5 of 12 (permalink) Old 11-29-2009, 04:36 PM
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You've got moisture in the cabin from some source. Check the carpets to see if they are damp. You may have a plugged drain for the cowl or some other water source. It doesn't seem likely the moisture is coming out of the vents; it is there, and the A/C is stirring it up.

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post #6 of 12 (permalink) Old 11-29-2009, 10:32 PM Thread Starter
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I have checked for leaks and everywhere is nice and dry there is no smell of antifreeze but will have a look for any plugged drains.
Will get the system checked out and most probably regassed as a precautionary measure
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post #7 of 12 (permalink) Old 11-29-2009, 10:47 PM
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5 replies and no feedback from the OP, on the other hand the question was only posted a day ago. Some more details about the issue would be useful anyway.

It may not make a difference but is this a W120 or a W220 model (US)?

The AC leak could lead to reduced cooling but this should not be an issue if the engine is warm and the ambient temperature is lower than the heating temperature setting. But we should know if the issue only happens at start up or also while driving. I sort of thought the "after 20/30 minutes" means it comes back while driving?

Anyway, you should have noticed if there is some refrigerant leak, had the AC system been checked for this?

The "steam up and warm damp smell" sounds more like a heat exchanger leak at the heater core, the antifreeze creates a sweet smell. But eventually you should have noticed some loss of antifreeze from the radiator, is this not the case?

If the smell is like mildew, either your HVAC is otherwise OK but just needs a treatment that kills mildew and bacteria. A heater core drain pipe would make water stay at the HVAC housing and would allow mildew to grow.

Too many different options to speculate about without some additional info about.
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post #8 of 12 (permalink) Old 11-29-2009, 11:29 PM
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Quote:
Originally Posted by Diesel Benz View Post
5 replies and no feedback from the OP
Check out the 5th reply, just before yours?
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post #9 of 12 (permalink) Old 11-30-2009, 03:27 AM Thread Starter
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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!
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post #10 of 12 (permalink) Old 11-30-2009, 08:54 AM
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Quote:
Originally Posted by Marsden View Post
Check out the 5th reply, just before yours?
A coincidence, the OP must have replied while I spent too much time writing my message (not the first time). The forum should show the "start time for writing replies". Why did you not answer him since you must have seen the question?
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