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What causes this in the headlights?

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MY03, in the morning or after a rain, there is a lot of moisture inside of the light assemblies, this also leaves a haze on the inside of the plastic lens.

What is causing this and is there a way first clean them and then prevent it from coming back?

The pictures I took this morning aren't the best but should give you the idea...




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TSB 4/01 9415 Headlight Assembly - Moisture Accumulation/Ventilation


Moisture accumulation inside the headlight assembly.


With a combination of weather, temperature, and humidity conditions, the headlight lens may become fogged with moisture for a short time.

The headlights of the 911 Carrera (996) /911 Carrera 4 (996) have a ventilation system which uses the incoming air from between the bumper cover and the lower part of the headlight assembly to remove the moisture. The headlights are also vented through plastic pipes located in the electrical connector that extend under the vehicle. Only a short driving time is necessary to clear moisture from the headlights when the ventilation system is in "operation".

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