Fog on the inside of headlight assembly

theJman · August 25, 2020

This afternoon I was out running some errands in my 2018 Sierra 2500HD and as I was leaving the last store it started to rain. It was spotty; sometimes it was light rain, sometimes drizzle, but certainly nothing heavy. The trip home was about 20 minutes so I wasn't on the road for any long period of time. As I'm unloading the truck I walk past the front and noticed there was fog on the inside of both headlights. It wasn't where the reflector or parking lights are but it was everywhere else so I assume the heat from the lights cleared those spots. I've had the truck a little over 2 years (bought new) and this is the first time I've seen that, although to be honest I never looked before (I didn't deliberately look this time either, it just jumped out at me). I went outside about 90 minutes after the rain stopped and there's still a little bit remaining.

A few months back I swapped the HID modules for Morimoto XB HID D5S but since I'm working from home since March I haven't gone too many places at night in the rain where I would be using the headlights. It seems hard to image that has anything to do with it though. It's also hard to imagine both assemblies went bad at the same time so that seems unlikely as well. Anyone else have a similar issue with their truck?

theJman · September 1, 2020

Bump.

Chrisk1 · September 2, 2020

Similar issue with mine in one of the high beams. Pull them apart (PITA) and dry them out with a blow dryer. When you reassemble them make sure they are sealed. After changing a bulb, mine wasn't and fogged up. Did the above and all is well.