Questo invece è specifico per anabbaglianti della C6.
Come vedete il problema cìè anche in America. Il bollettino è per ora solo in inglese... ed è molto recente...
Ciao

Headlamp Lenses Have Light Fog or Moisture - keywords fog head headlamp lamp light moisture #PIC3778 - (Nov 18, 2005)
Headlamp Lenses Have Light Fog or Moisture
2005-2006 Chevrolet Corvette

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Some customers may note that when the headlamps are on, light fog or cloudiness may be visible on the lenses. Some customers may also state that the headlamp lenses have condensation or moisture.

Recommendation/Instructions:
The headlamps feature a clear polycarbonate lenses. The light fog or cloudiness is caused by out gassing and is a normal characteristic of the vehicle. The headlamps are also vented, thus some condensation/moisture may be seen when humidity is high or there is a change in temperature. The moisture should burn off after one hour of headlamps being turned on. Please do not replace the headlamp lenses for the above concerns.