GMC 2000 Savana - Manual (Page 289)

yellow blue
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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.
Sidemarker Lamps
1. Remove the screw from the top of the lens.