Tools You'll Need:
* Socket set (metric): You'll likely need various sizes, including likely 10mm, 13mm, and possibly others.
* Screwdrivers (Phillips and possibly flathead): Sizes will vary depending on the screws used.
* Panel removal tools: These plastic tools help pry off interior door panels without causing damage.
* Pliers: Needle-nose pliers can be helpful for reaching small fasteners.
* New power window regulator: Make sure you get the correct one for your specific door (driver's side or passenger's side). Checking the part number on your old regulator is crucial.
* WD-40 or similar lubricant: This can help loosen stubborn screws or fasteners.
* Work light: Essential for visibility inside the door panel.
Steps (General):
1. Disconnect the Battery: This is crucial to prevent electrical shorts.
2. Remove the Interior Door Panel: This is usually done by removing screws around the armrest, door handle, and possibly some hidden under the panel itself. Use panel removal tools to gently pry the panel away from the door, being careful not to break any clips. There are often several clips holding it in place. Consult your repair manual for the exact location of these fasteners.
3. Disconnect the Window Motor and Harness: Once the door panel is off, you'll see the window motor and the regulator mechanism. Disconnect the electrical connector carefully.
4. Remove the Window: Most often, you'll need to disconnect the window from the regulator. This usually involves carefully detaching it from the clips or rollers. Support the window to prevent it from falling.
5. Remove the Old Regulator: This is the most involved step. There will be several bolts or screws securing the regulator to the door. You might need to maneuver the regulator to access all the fasteners. Take your time and photograph each step to help with reassembly.
6. Install the New Regulator: Carefully install the new regulator, ensuring that it's properly aligned and secured with all the fasteners.
7. Reconnect the Window: Carefully reattach the window to the new regulator.
8. Reconnect the Window Motor and Harness: Connect the electrical connector securely.
9. Reinstall the Door Panel: Carefully reattach the door panel, making sure all clips and screws are properly secured.
10. Reconnect the Battery: Reconnect the battery and test the window.
Important Considerations:
* Repair Manual: A repair manual specific to your 1999 Buick Century is highly recommended. It will provide precise instructions and diagrams for your vehicle's model.
* Safety: Always disconnect the battery before starting any work on electrical components.
* Patience: This is not a quick job. Take your time and be methodical to avoid damaging any parts.
* Professional Help: If you're not comfortable with car repairs, it's always best to take your car to a qualified mechanic.
This is a general guide. The specific procedure may vary significantly depending on your exact Buick Century model. Always refer to a repair manual for detailed, model-specific instructions before beginning the repair. Failing to do so can lead to damage to your vehicle.
