Cadillac STS Forum - 2005 through 2012 Discussion, Headlight Condensation in Past Cadillac Vehicle Discussion; Several weeks ago we got a few days of rain which left moisture in both of my headlights. Since then ...
Several weeks ago we got a few days of rain which left moisture in both of my headlights. Since then one of the lights dried out while the other retained the water. So yesterday I went to the trouble of trying to dry the one out and to silicon both of them to (hopefully!) prevent it from happening again. Doing this, I noticed that the headlight that had dried out had two weep holes - one facing forward and the other facing down - both on the side of the light towards the center of the car. The other headlight did not have these holes.
Was this assembly with the holes a replacement light? The holes don't look like they were drilled by the previous owner - look to be factory drilled.
Automobile(s): 2006 STS 4, 67 Firebird, and a pair of SS Impalas
Hamilton Ontario Canada
Re: Headlight Condensation
Both your lights will have vents. If the black vent tube with the 90 bend is missing, look for a D shaped hole on the back/ top of the head light.
My driver side light had this problem after driving in a heavy rain. Just wouldn't dry out. When I went to replace the small bulb in the corner, I noticed that the gasket was not put back in properly by the last person who changed it.
What I also noticed was that it was more than just moisture on the inside lens. The assembly had about an inch of water sitting at the bottom that cant be seen from the lens.
I blew as much of it out as I could with the compressor and put the gasket back in to make a good seal. Took about a week but it is now dry. I have driven in heavy rain since then and it is still dry.
Both of mine had the vents in the back with the 90 degree elbow. The holes I'm talking about are on the front. One is thru the clear front cover in the corner below the small peanut bulb. The other is in the bottom of the unit right in the same area. I'm guessing this assembly is aftermarket, not OEM?
OK, thanks. Didn't know there is no aftermarket option. Whoever did it did a good job - and it works. That headlight dried out. But, of course the holes could have let the moisture in to begin with. If my silicon work doesn't fix my problem I might consider doing the same thing on the other side versus having to remove the front bumper again.