skrubi12
Well-Known Member
- Joined
- May 30, 2018
- Threads
- 9
- Messages
- 266
- Reaction score
- 119
- Location
- New Market, MD
- Vehicle(s)
- 2018 JLUR
- Thread starter
- #16
I appreciate the explanation - helpful in understanding.I explained this in another thread questioning these headlights but i'll add it here too:
Headlamps are NOT sealed. They can't be. They have to be able to acclimate to the environment around them, else they would instantly fog up on the first cool morning and stay that way. The trick is that they need to breathe without allowing moisture in and we don't really have a perfect way to do that. It used to be horn vents that did it, which were essentially tubes that faced downward and relied on gravity to keep moisture out. Newer applications use aperiodic vents that work very slowly, which is why you will sometimes see fog on the lens if the lamp has been subjected to a cool damp day immediately following a warm dry one, OR any other quick change in temp and humidity. It takes a day or so for the air inside the lamp to "sync up" with the air outside it.
I have this happen pretty frequently to all my vehicles in the spring and fall. Again, it should go away quickly. If it sticks around for a few days that means that either the vent(s) is/are clogged or there is a leak somewhere.
Sponsored