C3 headlights: misting over due to water entry

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
Add pictures here
‚úĖ
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
tersono wrote:

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.
--
Malc

You know it's a bad day when even the aubergines are plotting against you
  Click to see the full signature.
Add pictures here
‚úĖ
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.