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· W210 Moderator
99 E320
5,541 Posts
pull the headlight and zapping with hair dryer.

pull the turn signal bulb and zapping with hair dryer.

trying to determine the cause is a separate issue, e.g. if pooled, or warm
moist vapor condensing on cold surface, this regularly happens after car
wash, etc etc.

p.s. if it has accumulated scuz and water deposits dried onto the innner
surfaces, the only thing is to pull the headlight assembly (easy for your
model) and pull off the outer plastic lens and clean.
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