Cadillac DeVille 2005 Owner's Manual page 354

5. Raise the jack until the metal flange fits firmly into
the channel of the jack head.
6. Put the compact spare tire near you.
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7. Raise the vehicle by turning the jack handle
clockwise. Raise the vehicle far enough off the
ground for the compact spare tire to fit under the
vehicle.
8. Remove all wheel nuts and take off the flat tire.