Before you begin:
* Get the correct replacement: You'll need the correct lock cylinder for your specific Saturn model and year. The part number is crucial. Your local auto parts store can help you find the right one. Consider getting a professional key made to match the new cylinder.
* Gather tools: You'll likely need small screwdrivers (Phillips and flathead), possibly a trim removal tool, and possibly pliers.
* Consult a repair manual: A Haynes or Chilton repair manual specific to your 1998 Saturn model will provide detailed instructions and diagrams. This is highly recommended.
General Steps (Vary by Location):
1. Disassembly: This is the most variable step. You'll need to carefully remove the interior door panel (for door locks), the steering column shroud (for ignition), or the trunk lining (for trunk lock). This often involves removing screws, clips, and possibly disconnecting electrical connectors. Be gentle to avoid breaking anything. The repair manual will be your guide here.
2. Access the Lock Cylinder: Once the panel or shroud is removed, you should see the lock cylinder mechanism. There will likely be screws or retaining clips holding it in place.
3. Disconnect the linkage: The lock cylinder is connected to a rod or cable that operates the locking mechanism. You'll need to carefully disconnect this linkage.
4. Remove the Lock Cylinder: Carefully remove the screws or clips holding the cylinder in place. Sometimes, it might be necessary to gently pry or wiggle the cylinder free.
5. Install the New Cylinder: Insert the new lock cylinder, ensuring it's properly aligned. Reattach the linkage.
6. Reassembly: Put everything back together in reverse order of disassembly. Make sure all screws and clips are securely fastened.
7. Test: Test the new lock cylinder to ensure it operates correctly.
Important Considerations:
* Ignition Cylinder: Replacing the ignition cylinder is more complex and may require specialized tools. It's strongly recommended you have a professional locksmith or mechanic handle this. Incorrect installation could damage your steering column or prevent your car from starting.
* Keys: You'll need new keys that match the new lock cylinder. A locksmith can cut keys to match the new cylinder.
* Security: If you're replacing a lock due to theft, consider replacing all locks (doors, ignition, trunk) for increased security.
Again, without knowing the specific lock cylinder you're replacing (door, ignition, trunk), this is only a general guide. Referencing a repair manual specific to your 1998 Saturn model is crucial for safe and successful replacement. If you're not comfortable working on your car, it's best to take it to a qualified mechanic or locksmith.
