How do you replace a headlight on a 2003 trailblazer?

Answer 1

Its not that easy. First you need to remove the grill. Easier than it sounds ther are a few clips in top and some on the sides. no screws need to be removed just the clips pull out. Once the grill is removed you have to pull up on the 2 metal or plastic tabs. One on each side of the assembly. Once you pull tabs up the whole headlight assembly will come out. then remove the rubber cover over the light you want to change and the bulb will be visible then twist out and pull out bulb i think it is a 4157 bulb.

Answer 2

If you just need to replace the bulb that is burned out:

Open the hood, find the back side of the bulb where the wires plug in.
Unplug it.
Give the bulb assembly 1\4 turn to the left (like you're unscrewing it)

Gently giggle and pull it out of the light housing.

If you have to replace the entire light housing. It's quite involved.