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Windows fogging up massively, despite dry interior

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by AndymT, Sep 11, 2017.

  1. AndymT

    AndymT New Member

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    Your Mercedes:
    C220d bluetec 2015
    Hello, regularly experiencing the above problem on my 2015 C220 Bluetec and I've seen reference to blocked windscreen drains on older, different MB models. Can anyone point me towards where to look on my model - or suggest other remedies - please?
     
  2. Ken_R

    Ken_R Senior Member

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    Location:
    Worcestershire, UK
    Your Mercedes:
    W203 2006 C230 Estate
    Also check your Pollen filter. If that has got wet it will cause the problem as described.
     
  3. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    Do you have your Aircon on to clear it . Is there water in the boot where the spare tyre is ?
     
  4. GlosRichCLK

    GlosRichCLK Senior Member

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    Your Mercedes:
    2001 CLK 230 Kompressor Cabriolet A208
    Another vote for pollen filter, easy to change.

    Also only run your AC on auto and let it do its thang....
     
  5. Droverunner

    Droverunner Senior Member

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    Location:
    West Cambridgeshire
    Your Mercedes:
    2007 CLK 220 CDI Sport AMG pack.
    From my experience... confirming much of the above... a car with aircon will only fog up if...

    Aircon is off. Pollen filter is blocked. Heating set to recirculate. Screen vents not on. Loads of water that shouldn't be in the car.
     
  6. flowrider99

    flowrider99 Senior Member

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    Your Mercedes:
    ML350 (W166) .............. SL500 (R230) ................
    Check under the carpets for any moisture, try leaving the car in the sun with the windows open and see if it improves, if we getting any more sun.
     
  7. OP
    AndymT

    AndymT New Member

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    Your Mercedes:
    C220d bluetec 2015
    Thanks for the ideas all. Definately not moisture in the car or boot, screen vents or recirculate switch on. We noticed this problem from the first few weeks of ownership. It's been MB serviced from new but I'll check the pollen filter in case they missed that. As for the aircon idea, maybe I'm being a bit thick but how does that work in the winter months when misting up is a real issue and you want warm air in the car, not freezing?
     
  8. flowrider99

    flowrider99 Senior Member

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    Your Mercedes:
    ML350 (W166) .............. SL500 (R230) ................
    you just turn the temp dial up for warm air.
     
  9. JBell

    JBell Senior Member

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  10. Droverunner

    Droverunner Senior Member

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    Your Mercedes:
    2007 CLK 220 CDI Sport AMG pack.
    I have noticed on cars with aircon that if you mistakenly switch off the aircon in the autumn/winter months at the start of a journey the screen can mist very quickly. But otherwise if you are using the climate properly by leaving it to auto then there should be no mist apart from exceptional winter mornings when you might need to push the clear screen boost for a minute when first starting.

    Re how the aircon works in the winter... Better on than off as it has a dryer in the system to remove moisture... better to have cooler dry air than warm moist air which is a classic for dropping out its moisture onto a cold screen.
     
  11. David Richardson

    David Richardson Senior Member

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    Your Mercedes:
    W169 A180 Avangarde & C Class Coupe 2002 220CDI
    You could run a 240v home dehumidifier in the car for a day & you'll be surprised just how much water
    it collects from the air inside your car
     
  12. Wighty

    Wighty Senior Member

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    Your Mercedes:
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    Leave your Aircon on all the time ,otherwise the Aircon compressor seals can dry out . Regulate the cars temperature by turning to hot or cold as normal . Aircon dries damp air wether hot or cold .
     
    stwat likes this.
  13. oigle

    oigle Senior Member

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    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    If the weather is rainy and cold, it is good to use recirc setting when starting up. Leave it on recirc for a few minutes at least before switching. Just gives the system a better chance of getting rid of the moisture without a new load coming in all the time.

    Ian.
     
  14. John Laidlaw

    John Laidlaw Senior Member

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