The headlamps in your GMC Acadia will eventually burn out, due to the amount of heat generated in the thin coil of wire in the headlight. Not only is it unsafe to drive with a burned-out headlight bulb, but doing so also is against the law. To avoid these potentially serious situations, replace the bulb in your headlight so your vehicle will be safe to drive.
Open the hood and prop it up. The headlights are located on the right and left sides at the front of the engine bay.
Remove the two-wire electrical connector attached to the rear of the headlight that needs repair. It is a plastic connector with a tab that can be pressed down with your fingers and then pulled outward.
Locate the rubber protector cap at the rear of the headlight housing. It is black and approximately 5 inches in diameter. Remove it by pulling it off the headlight housing. The rubber cap insulates the bulb and ensures that dust does not enter the housing. Removing it will provide you with ample access to the bulb; you do not need to remove the housing or assembly.
Locate the metal clip that holds the headlight bulb in place. Push downward to release the headlight bulb and remove it.
Insert the new bulb into the headlight, pushing the metal clip down to secure the bulb in place. Be sure not to touch the bulb with your bare hands because the oils on your fingers can damage it and shorten its lifespan.
Put the rubber cap back onto the headlight housing.
Plug the two-wire electrical connector back into the headlight.
Test your new headlight bulb for proper operation.
