So, this is how my headlights looked like after a wash with warm water. Is this a common issue? Is it fixable or am I going to need new headlights?

 

​​​​​​​Common.

 

This is a common issue. Mercedes has a "fix" for certain models that comprises a bag of silica gel to be placed in the bottom of the head lamp once the driver module (with the external heat sink fins) has been removed.
and also replacing a membrane tape that should allow moisture to get out but not in. Removing the head lamps to apply the kit is cumbersome. Some sources on the internet claims that there is a de-moisturing process that starts
after a certain time. I have not experienced that this procedure, if it exists, work.

Obviously, the non-ventillated head lamp design was not a success. I have the same problem and plan to install silica gel bags myself.

 

There was another forum member from another thread (forgot which one) was to seal the headlight up completely as they think there isn't enough heat to cause issue that requires vents. That might be a method to move forward but I don't know if there are any risks even though LEDs generally do produce low heat.

 

Easy fix. Don't wash with warm water.

 

Mercedes told me it was normal ! Likewise window seals pass water into door, thus when opening and closing windows they come up wet! My local mercedes dealers belong to the sandown group Poole Dorset, England. Do I trust them? certainly not. My moisture in the headlight assembly has cleared without further investigation.
mecedes is a word for revenue stream, servicing for example. I took my 2020 E-class 220d cabriolet to a trusted local garage when still under warranty. I love the colour and design of my car, but mercedes do not want to know, even if you have a good idea to improve the vehicle at little cost.

 

do not put silica gel packs to try to fix it, it will leak and damage the module.

 

Common across almost all makes and models... just part of the design I guess!

Trenton O. Gibson
tgibson@highline-autos.com
Highline Autos
Direct: 602.909.9216
Office: 480.348.0777