C3 headlights: misting over due to water entry

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tersono - 08 Jan 2007 19:53 GMT

I've already had one headlight replaced due to this fault, and now
it's happened to the other one.

I've tried putting dessicant behind the headlight - in the area
exposed when the rear cover is unclipped, but to no avail. The
headlight stays cloudy, the dessicant stays dry.

Surely the unit can't be so well sealed that the dessicant can't "see"
the moisture?

Where does the moisture get in anyway?
--
Per ardua ad nauseam

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malc - 08 Jan 2007 21:18 GMT

> I've already had one headlight replaced due to this fault, and now
> it's happened to the other one.
[quoted text clipped - 7 lines]
>
> Where does the moisture get in anyway?

Obviously I don't know about the C3 but my XM had the glass held onto the
reflector by a series of clips. Between the reflector and the glass was a
rubber seal. It could be that this seal is damaged. It might be worth
running a bead of silicone around the joint. I should imagine that the bulb
pretty much fills the hole in the back of the reflctor which is why your
dessicant isn't working. I'd take the bulb out and blow a hairdrier into the
hole for a few minutes to dry out the light. Replace the bulb then try
sealant.

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Malc

You know it's a bad day when even the aubergines are plotting against you

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