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Moisture in headlights!

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Old Feb 5, 2020 | 03:42 AM
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c300
Moisture in headlights!

I just got a 2019 c300 with only 200 miles on it. When I drove the car home from the dealer, I noticed that there are moisture in both headlights, it's been 3 days but it hasn't gone away. I asked the manager at the dealership. He said "It is normal, because the headlights has some kind of "breathing system" which allows moisture to come in and cool out the headlight housing".. Is this true guys? I never heard of it.

Sorry this is my first c300, please help me. Thank you guys.
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Old Feb 5, 2020 | 04:54 AM
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Seems to be a common issue on vehicles with LED or HID lights and not just Mercedes as they don't produce the same amount of heat as the halogen bulbs.

This means the light units stay a lot cooler.
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Old Feb 5, 2020 | 06:31 AM
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Last sentence of Interactive Operator´s Manual

Last edited by Matejgigi; Feb 5, 2020 at 06:33 AM.
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Old Jul 15, 2022 | 06:28 AM
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land rover
The moisture absorber bags are a temporary solution, also are the best way, simple, convenient and economical. Many people worry about safety because they don't understand its material and working principle (Work Principle of Car Moisture Absorber). The desiccants are made of materials and chemical formulas such as calcium chloride and silicon dioxide. These materials form molecular “nets” and form bonds that allow them to hold water molecules within their chemical structure. Can reuse some absorbers by drying them outside or heating them until they lose the moisture they gathered. Don't worry about high temperature causing fire problems. I think many car owners have already used this method.
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Old Oct 26, 2023 | 04:18 PM
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If you are looking for moisture absorber for your car don't miss this list. Read Here
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Old Oct 28, 2023 | 06:42 PM
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Originally Posted by Mikesmith2939
Seems to be a common issue on vehicles with LED or HID lights and not just Mercedes as they don't produce the same amount of heat as the halogen bulbs.

This means the light units stay a lot cooler.
Well I think its unfortunate these HL need to be.poorly vented.
As it turn out... our high power LED HL generate enough heat to require a cooling FAN spinning all the time.

I've seen my HL filled with heavy condensation after driving through a short 2Mi long stretch foggy freeway.

I am concerned to see the HL control module is conveniently located at the lowest section where condensation has a chance to pudle - These electronic modules are unsealed...

Control requires coding to match L/R

I intend to coat circuit board and RTV-seal the controller Module and limit water entry from 3 vents using dryer sheet synthetic material.
As noted many car brands feature this new issue worked in by supplier: Hella?
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