Chevrolet 1999 Express Van, Owner'S Manual, Page: 271 / 378

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2. Remove the lamp from the grille. 3. Squeeze the tab on the side of the bulb assembly
while turning it counterclockwise. Remove the bulb
assembly from the back of the lens and replace
the bulb.
Reverse Steps 2 and 3 to replace the bulb. Turn the
socket clockwise to replace it in the lens assembly.
replace the screws on the parking/turn signal
lamp assembly.