Chevrolet 1994 Astro Passenger Owner's Manual page 211

Raising your vehicle with the jack improperly positioned will
damage the vehicle or may allow the vehicle to fall off the jack.
Be sure to fit the jack lift head into the proper location before
raising your vehicle.
Raise the vehicle by
rotating the ratchet to
the right. Make sure
the
UP
marking faces
you. Raise the vehicle
far enough off the
ground so there is
enough room for the
spare tire to fit.
Remove all the wheel
nuts.