Chevrolet 2001 Express Van Owner's Manual page 303

Sealed Beam Headlamp
1. Remove the four screws from the headlamp retainer.
Pull the retainer out and set it aside.
2. Unplug the lamp assembly from the connector.
3. Remove the old headlamp
4. Install a new headlamp into the assembly.
5. Plug the assembly back into the connector.
6. Reassemble the headlamp assembly with the retainer.
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Composite Headlamps
1. Open the hood.
2. Locate the rear side of each of the headlamps.
3. Without removing the headlamp assembly itself,
remove the bulb socket from the back of the headlamp
on the driver's side. Turn the bulb counterclockwise
one quarter turn to remove it from the socket.
4. On the passenger's side, turn the bulb clockwise one
quarter turn. Also, to remove the bulb on the
passenger's side, you will need to move the battery.
Do not touch the glass part of the bulb.