Chevrolet 2010 Cobalt Owner's Manual page 375

3. If necessary, use the flat end of the wheel wrench
to pry along the edge of the rear wheel cover until
it comes off.
Store the wheel cover in the trunk until the flat tire
is repaired or replaced.
4. Use the wheel wrench to loosen all the rear wheel
nuts. Do not remove them yet.
Notice: Make sure that the jack lift head is in the
correct position or you may damage your vehicle.
The repairs would not be covered by your warranty.
5. Position the jack lift head at the rear jack location
nearest the rear tire. The rear location is about
4 inches (10 cm) in front of the rear wheel opening.
I n f o r ma t i o n P r o v i d e d b y : 6-103