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Nuclear engineer
02/2012 X5 35d M57Y CPO 119K miles NOKIAN WR G3 30K miles
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23,053 Posts
Maximize time with high beams to heat and evaporate the moisture. There are vents in the assembly.
 

·
Nuclear engineer
02/2012 X5 35d M57Y CPO 119K miles NOKIAN WR G3 30K miles
Joined
·
23,053 Posts
I would be more concerned about how water got there in the first place. Seems to me that, if not corrected, it will happen again.
Operating the headlight warms the assembly, expanding the air and venting excess volume/pressure. When the headlight is shut off the assembly cools, contracting the enclosed air and drawing humid environmental in to equalize the pressure. The humidity moisture condenses in the interior and the droplets have no way to run out and accumulate for you to see the ‘wetness’.

The headlights are not pressure sealed.

Headlights are fogged over
Repair notice for assessing condensation in the headlamp
The images show the difference between mild and severe condensation in the headlamps of various vehicles.
Note:
  • A headlamp with substantial condensation can be recognized by the formation of droplets on the inside of the headlamp unit.
  • The appearance of moisture immediately following cleaning in an automatic car wash or after the vehicle is driven in heavy rain can point to severe condensation and possible indicate a headlight that is not effectively sealed. (Usually occurs only on one side)
  • The condensation phenomenon is promoted by damp, humid air that penetrates into the headlamp from the outside by entering through the ventilation system. This then evaporates in the headlamp while it is still warm, and when the unit cools it then precipitates to form condensed moisture of the inside of the headlamp lens.
  • This neither causes corrosion damage to the headlamp, nor does it exercise a negative impact on the intensity of the light that it emits.
Insect protection conversion
Information on the conversion of the insect protection system
1st operation:

Disassemble outer and inner ventilation on both headlights by pulling it off.
Overview of xenon headlight ventilation
 
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