Mercedes-Benz CLK-Class Owner's Manual page 331

Practical advice
Troubleshooting
Headlamps
Problem
The headlamps are misted up on the in-
side.
328
Possible cause/consequence
Air humidity is very high.
The headlamp housing is not airtight, al-
lowing moisture to enter.
Suggested solutions
Drive with the lights switched on.
The misting-up disappears after a short
distance.
Have the headlamp checked at a
qualified specialist workshop, e.g. a
Mercedes-Benz Service Centre.