WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Removing Crankshaft Rear Oil Seal
Courtesy of GENERAL MOTORS CORP.
Remove the crankshaft rear oil seal.
IMPORTANT:
Do not damage the crankshaft or seal bore.
Pry out the crankshaft rear oil seal out using a suitable tool.