Tools You'll Likely Need:
* New Cylinder Lock: Make sure you get the correct one for your Buick Century's year and model. You'll probably need the key code or VIN number to ensure compatibility.
* Screwdriver(s): Phillips and/or flathead, depending on the screws holding the door panel and lock mechanism.
* Panel Removal Tools: These plastic tools help prevent scratching the door panel when removing it.
* Needle-nose pliers: Might be needed to carefully manipulate some parts of the mechanism.
* Possible small hammer or punch: (Use with caution!) Might be needed to gently tap certain parts loose.
Steps (General Outline - Consult a Repair Manual for Specifics):
1. Disconnect the Battery: This is a crucial safety precaution to prevent accidental short circuits.
2. Remove the Interior Door Panel: This usually involves removing screws around the edges and possibly some clips. Carefully pry the panel away using your panel removal tools. There are many online videos showing how to do this for a 1991 Buick Century specifically - searching for "[Year] Buick Century door panel removal" on YouTube will be very helpful.
3. Locate the Cylinder Lock Mechanism: Once the door panel is removed, you should see the lock mechanism itself. It's usually held in place by screws or clips.
4. Disconnect the Linkage: There will be linkages connecting the cylinder to the locking mechanism inside the door. Carefully disconnect these linkages. Take pictures if needed to remember how they go back together.
5. Remove the Old Cylinder Lock: Remove the screws or clips holding the cylinder in place. Gently pull the cylinder out.
6. Install the New Cylinder Lock: Insert the new cylinder into the mechanism, making sure it's aligned correctly. Secure it with the screws or clips.
7. Reconnect the Linkage: Carefully reconnect the linkages to the new cylinder.
8. Reinstall the Door Panel: Put the door panel back in place and secure it with the screws or clips.
9. Test the Lock: Try locking and unlocking the door with your new key to ensure it functions correctly.
10. Reconnect the Battery: Reconnect the battery.
Important Considerations:
* Repair Manual: A repair manual specific to your 1991 Buick Century is highly recommended. It will provide detailed instructions and diagrams.
* Key Codes: If you're getting a new cylinder, you might need your key code or VIN number to ensure you get the correct one. Your local dealership or a locksmith can help with this.
* Professional Help: If you're unsure about any step, it's always best to seek professional help from a locksmith or mechanic. Attempting this repair incorrectly could damage your door or lock mechanism.
This process is inherently more complex than a simple description can provide. Visual aids are absolutely essential. Search YouTube for "1991 Buick Century door lock cylinder replacement" for visual guides and to better understand the steps involved. Remember safety first!
