Quote:
Originally Posted by LifeTech
All headlamp housings have Vents for moisture relief. A perfectly brand new headlamp housing may exhibit moisture within the housing from time to time because these housings are not sealed from atmosperic conditions i.e. high humidity and heaving rain and ice buildup on the outside will induce internal moisture. This is part of the design. It is important to inspect these vents as they can get clogged with dirt over the years and can also be the cause of persistant internal mositure...which can cause permanent clouding inside the lens over time.
These vents are usually located high up on the rear of the housing... ususally two of them located apart from each other. As the heat from the bulb builds up, the moisture evaporates and the inside lens clears up of mositure.. So in fact it not necessarily a slight or minor crack that will produce this moisture alone.
These vents appear to be short rubber downturned nipples/hoses or similar in description. Look closely at the back of your light housing(s).
For many many years Europe has been using this "unsealed design" and for this reason The USA/DOT (feds) have only recently allowed them for US use. That's why the "Sealed Beam Headlight" Bulbs only disappeared recently during the mid '80's in favor of this European design. The Feds finally allowed them along with with it' inherent design flaw. But it enabled Mfrs. to contour these "Unsealed headlamp housings" more efficiently into the front body design for esthetic and areodynamic purposes.
Just some food for thought.
LT  |
But there is a way to protect your investment head light cover's from Avs which is a shield.I've had mine on since 2005 and love them and yes I do use the plastic xx cleaner and No problems. My old 2000 Tundra was toast after 2 year's this method is working for me.
ERik
