Oldsmobile 1999 Alero - Manual (Page 213)

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The following steps will tell you how to use the jack and
change a tire.
Removing the Spare Tire and Tools
The equipment you’ll need
is in the trunk. Pull the
carpeting from the floor of
the trunk. Turn the center
retainer nut on the
compact spare cover
counterclockwise to
remove it.
Lift and remove the cover. See “Compact Spare Tire”
later in this section for more information about the
compact spare.