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Headlight Condensation #5294297 12/14/19 12:59 PM
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rrretiree7 Offline OP
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I have a 2010 Cadillac CTS and I have condensation behind my Headlights. How did it get there and
how can fix it? Thanks guys

Re: Headlight Condensation [Re: rrretiree7] #5294349 12/14/19 02:07 PM
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spasm3 Offline
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A small leak somewhere, where rain water can get in.

Take the assembly out, take the bulbs out. Bring it inside the house to dry out. When its dry, coat the edges of the lens to the body with this.

https://www.amazon.com/Permatex-817...ht+sealant&qid=1576353970&sr=8-7


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Re: Headlight Condensation [Re: rrretiree7] #5294350 12/14/19 02:07 PM
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hallstevenson Online Content
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Generally, between the clear part of the headlight and the back (bezel ?), there's a "seal" that's no longer 100%. You have to heat up the assembly, spread it apart, and replace the seal. This stuff, butyl replacement seal material from Morimoto, is considered top-notch stuff. It looks like rubber weatherstripping when you install it but when it's heated, it turns into caulk-like material.

Re: Headlight Condensation [Re: rrretiree7] #5294388 12/14/19 02:55 PM
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Kestas Offline
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I once found a breach in a seal by immersing the assembly in heated water. The heat caused the air in the assembly to heat up and bubble at the leak.

Re: Headlight Condensation [Re: spasm3] #5294447 12/14/19 04:00 PM
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atikovi Online Content
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Originally Posted by spasm3
Take the assembly out, take the bulbs out. Bring it inside the house to dry out.


Which requires removing the bumper if I recall.

Re: Headlight Condensation [Re: atikovi] #5294451 12/14/19 04:06 PM
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spasm3 Offline
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Ohh that sucks, but I don't know how else you can seal all around the lens joint, without removing it.


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Re: Headlight Condensation [Re: atikovi] #5294544 12/14/19 06:17 PM
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hallstevenson Online Content
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Originally Posted by atikovi
Originally Posted by spasm3
Take the assembly out, take the bulbs out. Bring it inside the house to dry out.


Which requires removing the bumper if I recall.

The OP asked how to fix it. If that's required, then he/she will have to do that.

Re: Headlight Condensation [Re: spasm3] #5294621 12/14/19 08:03 PM
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atikovi Online Content
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Originally Posted by spasm3
Ohh that sucks, but I don't know how else you can seal all around the lens joint, without removing it.


Not particularly hard to remove but I always get nervous when I have to snap it out of the fender retainer. Often you tear the tabs on the bumper and then it doesn't fit good when you put it back.

[Linked Image from fototime.com]

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