The tire sealant and compressor kit is located in the trunk.
1. Open the trunk. See Trunk.
2. Lift the trunk liner.

3. Remove the retainer that holds the tire sealant and compressor kit.
4. Remove the kit from the foam container.
To store the tire sealant and compressor kit, reverse the steps.
Tire Sealant and Compressor Kit
Changing a Flat TireChevrolet Cobalt Owners Manual. Wheel Replacement
Replace any wheel that is bent, cracked, or badly
rusted or corroded. If wheel nuts keep coming loose,
the wheel, wheel bolts, and wheel nuts should be
replaced. If the wheel leaks air, replace it (except some
aluminum wheels, which can sometimes be repaired).
See your dealer/retailer if any of ...