The frozen lock cylinders due to the cold weather may be repaired using the following procedure:

1. Apply heat to the cylinder area with a heat gun.
2. Hold the shutter door open with a paper clip or similar item and force air into the cylinder using compressed air and a blow gun attachment.
3. While holding the shutter door open inject a small amount of multi-purpose lubricant GM P/N 12346241 or equivalent.
4. Work the key into the cylinder several times and wipe any excess lubrication residue from the key.