Before You Begin:
* Consult a Repair Manual: A Haynes or Chilton repair manual specific to your 1994 Buick Century is *crucial*. It will provide detailed, illustrated instructions unique to your car's model. This is far more reliable than general advice.
* Gather Tools: You'll need screwdrivers (Phillips and flathead), possibly a socket set, panel removal tools (to avoid scratching the interior), and potentially a trim removal tool.
* Safety First: Disconnect the negative battery terminal before starting any work to prevent electrical shocks.
General Steps (vary by door):
1. Interior Door Panel Removal: This is usually the most involved step. Your repair manual will show you how to carefully remove the door panel. It typically involves removing screws, clips, and possibly disconnecting the power window switch and other components connected to the panel (interior door handle, etc.). Be gentle to avoid breaking clips.
2. Access the Window Regulator and Motor: Once the door panel is off, you'll see the window regulator mechanism and the window motor. The motor itself might be attached directly to the regulator or have its own separate mounting. The manual will show the specific arrangement.
3. Disconnect the Window Motor: Disconnect the electrical connector to the motor. Take pictures to help you remember how it goes back together.
4. Remove the Window Motor: This often involves removing screws or bolts holding the motor in place. Again, your repair manual is essential here.
5. Install the New Window Motor: Carefully install the new motor, ensuring it's correctly seated and aligned. Secure it with the appropriate screws or bolts.
6. Reconnect the Window Motor: Reconnect the electrical connector.
7. Reassemble: Carefully put everything back together in reverse order of disassembly. Make sure the door panel is securely fastened and all clips are properly engaged.
8. Test: Reconnect the battery negative terminal and test the window operation. If it doesn't work, double-check your connections.
Important Considerations:
* Window Regulator: Sometimes the window regulator itself is faulty, not just the motor. Inspect the regulator for any signs of wear or damage before assuming only the motor needs replacing. Repairing or replacing the regulator can be a more complex job.
* Difficult Access: Accessing the motor can be tight and fiddly. Patience and careful attention to detail are crucial.
* Professional Help: If you're uncomfortable performing this repair, it's best to take your car to a qualified mechanic. Incorrectly reassembling the door panel or regulator can lead to further damage.
Again, emphasizing the use of a repair manual is paramount. It will provide the specific procedures and diagrams for your vehicle, greatly increasing your chances of a successful repair.
