How do you replace low beam headlight in a 2002 Chevy Malibu?

This works for a 2003 Blazer, they may be the same.

You will actually have to remove the head light assembly to access the bulbs. The procedure will not throw off the headlight aiming a bit and it is real easy.

If you look at the top of the radiator support just above where the head lights are, you sill see two black plastic pieces that lean in toward the engine compartment on each side. They are about an inch, or so, wide. Just pull/lever them up and the head lamp will pop out for access to the bulbs.

You will need to pop out the center grill and then on each headlight unit there are two tabs (one on each side of unit) that you need to pull up. After that carefully pull out the headlight unit and remove the wires that are for the lights. To change the bulb remove the large rubber cap and twist the bulb holder to remove the bulb from headlight unit.