On the 2009 GMC Arcadia, the best way to access the headlight bulbs on this vehicle is to remove the wheel house liner. Once you remove the liner, you will have a clear access to the bulb covers. Turn the headlight bulb cover counter-clockwise to remove it. Unplug the electrical connector to the bulb. Rotate the bulb assembly a quarter turn counter-clockwise to release it from the headlight assembly.
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