Chevrolet 1998 Express Van Owner's Manual page 115

Underhood Reel Lamp (Option)
If you have an underhood reel lamp, it is located on the
passenger side of the engine compartment. The lamp can
be switched on without unreeling the cord. Also, you
can use it as a flashlight.
To use the lamp as a flashlight, pull down on the lever
located under the lamp, unlocking the lamp and pull the
lamp out. The cord will unreel as you pull the lamp.
When you are done using the lamp, reel the cord back
into the housing by turning the handle.
Then, slide the lamp into the holder and press the lever
marked PUSH at the bottom of the holder to lock into
the slot.
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