Here's a general guide. Consult your Buick Century's repair manual for precise location and specifics for your model year:
1. Locate the Blower Motor Resistor:
* Behind the Glove Box: This is the most common location. You'll likely need to remove the glove box completely to access it. This usually involves removing a few screws or clips holding it in place.
* Under the Dashboard: This location requires more disassembly, potentially involving removing parts of the dashboard trim. Refer to a repair manual for your specific model to understand which panels to remove. You may need to work with a flashlight and potentially use trim removal tools to avoid damaging the plastic.
2. Disconnect the Electrical Connectors:
Once you locate the resistor, carefully disconnect the electrical connectors attached to it. Take note of how they connect so you can put them back correctly. Some connectors are simple push-on types, while others may require a slight twist or lever to release.
3. Remove the Old Resistor:
The resistor is usually held in place with screws or clips. Remove these fasteners and carefully remove the old resistor.
4. Install the New Resistor:
Install the new resistor, ensuring it's oriented correctly. If there were any shims or spacers, reinstall them as well.
5. Reconnect the Electrical Connectors:
Carefully reconnect the electrical connectors to the new resistor, making sure they are securely seated.
6. Reassemble:
Carefully reassemble the glove box or dashboard components you removed, ensuring everything is properly secured.
7. Reconnect the Battery:
Reconnect the negative battery terminal.
8. Test the Blower Motor:
Turn on the ignition and test all blower motor speeds. If all speeds work correctly, you've successfully replaced the blower motor resistor.
Important Considerations:
* Repair Manual: A repair manual specific to your 1999 Buick Century is highly recommended. It will provide detailed diagrams and instructions that are far superior to a general guide.
* Tools: You'll likely need screwdrivers (possibly Phillips and flathead), possibly trim removal tools, and a flashlight.
* Safety: Always disconnect the negative battery terminal before starting any electrical work.
* Part Number: Ensure you purchase the correct replacement blower motor resistor for your specific Buick Century model. The part number can be found in your repair manual or by searching online using your vehicle's VIN.
If you're not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Improper installation could damage other components or even create a fire hazard.
