TT Roadster L4-2.0L Turbo (BPY) (2008)
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Backup Lamp: All Technical Service Bulletins
Lights - Condensation Visible Inside Exterior Lamps
94 08 48
2012749/7
November 18, 2008.
Supersedes Technical Service Bulletin Group 94 number 08-03 dated January 28, 2008 for reasons listed below.
Affected Vehicles
94 Exterior lights, moisture accumulation
Condition
Condensation is visible on the inside of the headlight, taillight, fog light, side marker light, front turn signal, daytime running lights, or third brake light
lens.
Technical Background
Damp air settles on the inside of a cold lens, which creates condensation.
The headlight circulation system allows air from the outside to flow through the headlights. This open water-protected ventilation system (needed for
pressure compensation) creates different climate zones in the headlight: very warm areas, where the lens is warmed up by the light, and relatively cool
areas, where the lens is cooled down by the air flow.
Considerable differences in humidity and temperature between the inside and the outside of the headlights, even while driving, can lead to condensation.
This is especially true in cold and wet weather, but it can also happen after a car wash, after steam cleaning the engine or the front end, with overnight
temperature changes, etc. This phenomenon is more visible on lenses made of clear glass than on lenses with patterns. The moisture doesn't affect the
headlight function (light performance) and doesn't lead to corrosion or other damage to headlight parts.
Production Solution
Not affected.
Service
For headlights, the affected lens surface should be clear after approximately 10 minutes of light operation, although the entire lens surface may not clear.