steamy windows

mariuss

New Member
Joined
Jul 2, 2010
Messages
11
Location
London and RO.
Car
CLK C 209
Everytime I have my car washed or it's raining my windows get steamy when I use the heating. I need to use the air con to get rid of the steam. Does anyone know what's causing the steam and what is the solution to this problem.
:(
 

whitenemesis

MB Club Veteran
SUPPORTER
Joined
May 7, 2007
Messages
17,964
Car
Lexus RC300h F-Sport 2019
You don't say what model you have but ..

Really should leave the a/c on auto permanently, that's how MB designed it...

You might have blocked drain tubes in the windscreen scuttle or the heater matrix. Your pollen filter may be blocked/damp.
 

Dieselman

Banned
Joined
Jul 13, 2003
Messages
34,206
Car
Peugeot 403 Convertible
There is water leaking into the car from somewhere, you shouldn't need the A/c on to keep the car clear.
 

jefrs

Active Member
Joined
May 30, 2010
Messages
617
Location
Berkshire
Car
S210 E320 Avantgarde '98 full load
If it is raining, then yes you should need the heater and hence the aircon on to stop misting. This seems normal to me even without any leaks. I can remember cars without heaters, we had to open windows and keep wiping the screen when it rained - ridiculous.

I have no idea which heater/aircon you have but mine runs up the aircon to dehumidify when in full heat defrost mode. It is supposed to be on.

Turning the aircon off can result in the pump not running for long periods and then it loses pressure. I found out the hard way over the winter when I had a wire-off at the compressor.
 

millo777

MB Enthusiast
Joined
Mar 9, 2011
Messages
1,245
Location
Swansea, Dubai, Riyadh
Car
1997 W140 S600L/2003 S211 320cdi
I think whitenemesis nailed it, either a leak or a damp pollen filter.

Having said that, I recently had a similar problem on my w124 estate only to find a 1.5l bottle of water had spilt in the boot liner and remained hidden by the load cover. 1 old towel later, and problem solved.
 

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