Correct binding or sticking door lock cylinders or keys that are hard to insert by applying the proper lubrication. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication.

DO NOT use penetrating lubricants (such as GM P/N 1052949 and WD-40®). These lubricants wash out the original lubrication and eventually evaporate, leaving little or no lubricating material. You may use these lubricants in order to unfreeze or loosen lock cylinder components. Refer to the following procedure.

1. Apply heat to the lock cylinder with a heat gun. Be careful not to damage the painted surfaces.
2. Hold the lock cylinder shutter open with a paper clip or the equivalent.
3. Force air into the cylinder using compressed air and a blow gun attachment.
4. While you hold the lock cylinder shutter open, inject a small amount of lubricant into the cylinder.

Refer to the above specifications.

5. Work the key into the lock cylinder several times.
6. Wipe away any excess lubricant from the key.