Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Frozen Lock Cylinder Repair

1. Warm the cylinder using a heat gun.
2. Hold the shutter door open with a paper clip while forcing air into the cylinder using compressed air and a blow gun attachment.
3. Inject a small amount of GM P/N 12342241 into the open shutter.
4. Work the key into the cylinder several times.
5. Wipe away excess lubrication from the key.