My right headlight lets water leak into the light assembly. This is the second time this has happened. Is there a fix for this other than replacing the whole assembly? Thanks

 

It has happened to mine as well. It happened when I went through a touchless wash, that had a air dryer for it's last cycle. Any water that was lying around the assembly got pushed into the assembly through the easiest path possible.

I removed the headlight from the car, removed the ballast (under the assembly) and used a hair dryer to completely dry out the assembly. I also removed the rubber boots for the hi and lo beam lamps, and dryed in there as well.
Once everything is dry, then try to figure out where the water infiltration is coming in. It will not be from the 2 white vents, so you can discount those.
I found that my assembly was allowing water in from the sealant(adhesive) for assembly to lens. There was a section at the tip that looked like it was not sealed as good as it should of been.

I took some clear silicone sealant ( marine type) and spread a nice even coat around the whole assembly between assembly and lens. To be sure, I also sealed the rubber boots with silicone along the edges, and I did the ballast as well.
Some of the dried moisture can be seen on the inside of the lens, but nothing I can do with that until the winter. I plan on replacing the lenses over the winter, so I will make sure the new ones are adhered very good.


Since then, I haven't had any moisture or lens fogging up.