Chevrolet 1997 Astro Owner's Manual page 266

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Lift the hood, release the hood prop from its retainer and
put the hood prop into the slot in the hood.
Before closing the hood, be sure all the filler caps are on
properly. Then lift the hood to relieve pressure on the
hood prop.
Remove the hood prop
from the slot in the hood
and return the prop to
its retainer.
Then just pull the hood
down and close it firmly.
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