Windows fogging up massively, despite dry interior

[AndymT]

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?

 

[Ken_R]

Also check your Pollen filter. If that has got wet it will cause the problem as described.

 

[Wighty]

Do you have your Aircon on to clear it . Is there water in the boot where the spare tyre is ?

 

[GlosRichCLK]

Another vote for pollen filter, easy to change.

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

 

[Droverunner]

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.

 

[flowrider]

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.

 

[AndymT]

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?

 

[flowrider]

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?

you just turn the temp dial up for warm air.

 

[JBell]

You can get a car dehumidifier off Amazon, just leave it in the rear passenger foot well when you are not in the car and dry it out every week, they work well

https://www.amazon.co.uk/Pingi-PD-A...05208850&sr=8-3&keywords=car+dehumidifier+bag

 

[Droverunner]

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.

 

[David Richardson]

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

 

[Wighty]

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 .

 

[oigle]

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.

 

[John Laidlaw]

You can get a car dehumidifier off Amazon, just leave it in the rear passenger foot well when you are not in the car and dry it out every week, they work well

https://www.amazon.co.uk/Pingi-PD-A...05208850&sr=8-3&keywords=car+dehumidifier+bag

+ 1 for this- I had a similar unit in my SL and it worked great (stuck mine under the passenger seat)