jm2

So I've been searching around and I haven't really found much information on this topic, specifically for the W205 C-Class. I recently noticed that one of my headlights have been fogging up and it's a bit concerning to me. I know that the manual says that moisture can accumulate in the headlights depending on the climate but in my case it seems a bit excessive. The moisture inside has yet to go away and it's been nearly a week, although it has been rainy lately. I have also taken it to the dealership and they said it's normal. What do you guys think?

It started out like this:
http://imgur.com/iFr7Jum

After a few days it seemed worse:
http://imgur.com/LiklWoe

http://imgur.com/TL6sP8Y

rbrylaw

I"m sorry, but I think that's totally unacceptable. Take it back to your dealer.

jm2

Any advice on how to approach this if they refuse to fix it?

Luton Driver

Off topic but what happened to your tow attachment cover? Back on topic you clearly have a hole somewhere that is allowing moisture in. Can't see how your dealer can refuse to act.

jm2

The cover went missing somehow. Had the dealer order a replacement but it has yet to come. I scheduled an appointment with the dealer about the headlights so I'll see how it goes.

ManiacGT

I've seen some fogging in mine but only minor and never enough to form droplets.

Television

These lamps must not be air tight, on some and I believe the mod is to drill 2 extra holes in the back plate.

ManiacGT

They're not supposed to be air tight. All headlamps are ventilated to some degree as all air contains moisture and they need to circulate air.

rbrylaw

If the dealer won't work with you, elevate to MB directly.

I live in a hot and humid place. Tampa, FL. We get a lot of rain and humidity and I've never had that much moisture in my lights. Never. A little fogging is acceptable. What you posted is not.

parkwood

I reguarly get fogging not as severe as in your photos but nevertheless a regular occurance. The manual clearly states it is expected. I live in north west france which is relatevily damp and currently it is way above seasonal norms temperature wise so much more humid than normal at this time of year.

I have found this on the net which may help in your discussions with your dealer as to whether there is a fault in your headlamp or it is more a cumulative affect from thecweather conditions where you are.

http://www.carlightblog.com/2014/06/24/fogging-the-ultimate-guide/

dbldpr

I had a lens fog up on my wife's car. I took out the entire unit. Blow dried the inside then applied clear silicone caulk on all the seams. Put the unit back in after it dried. That was 4 years ago and it has not fogged up since.