You can also use a heat gun if you don’t have a hair dryer. If there’s water pooling in your headlight, applying heat externally will not be enough to make it all evaporate.
If you don’t know how to take out your tail light, consult with your vehicle’s manual or take it to a mechanic.
The box will help trap the heat so the water evaporates more quickly. Avoid cutting the hole larger than the hair dryer’s nozzle, or else the heat will escape out of the box.
You can put your light horizontally or vertically in the box.
If you still see condensation, run the hair dryer for another 5 minutes. The tail light housing may be hot to the touch, so be careful when you grab it. Use an oven mitt or a thick work glove to grab it if you need to.
Start your vehicle’s battery and turn on your tail lights to make sure they work properly. If they don’t, try taking apart the tail lights again to check the wire connections.
Only seal the tail light once it’s completely dry, or else you may trap moisture inside.
You can buy O-rings from automotive or hardware stores.
Check your vehicle’s manual if you have trouble locating the vents on your tail lights. If the vents get clogged, moisture that’s trapped inside your lights won’t be able to escape.
