Tools You'll Likely Need:
* Socket set (metric)
* Ratchet and extensions
* Screwdrivers (Phillips and possibly flathead)
* Pliers (needle-nose might be helpful)
* Wire connectors/crimpers (if you need to replace any connectors)
* New wiper motor
* Shop towels or rags
* Possibly a torque wrench
Steps (General):
1. Disconnect the Battery: This is crucial to prevent electrical shorts and injury. Disconnect the negative (-) terminal first.
2. Access the Wiper Motor: This is usually located under the cowl, the area beneath the windshield wipers. You'll likely need to remove the wiper arms (after disconnecting the electrical connectors), the cowl panel (often held on by clips and screws), and potentially some other trim pieces. This step varies significantly depending on the specific Grand Marquis model. Refer to your repair manual for detailed instructions on removing the cowl and accessing the motor.
3. Disconnect the Wiper Motor: Disconnect the electrical connector(s) from the motor. Take photos or make notes to remember how they're connected for reassembly. You may also need to disconnect the linkage connecting the motor to the wiper arms. This often involves removing bolts or clips.
4. Remove the Wiper Motor: Once the electrical connections and linkage are disconnected, the motor itself should be relatively accessible. It's usually held in place by bolts or nuts. Carefully remove these fasteners.
5. Install the New Wiper Motor: Carefully install the new wiper motor, ensuring it's correctly seated. Reconnect the linkage and ensure it moves freely.
6. Reconnect the Electrical Connector(s): Connect the electrical connector(s) securely, matching them to their correct positions as noted earlier.
7. Reassemble Everything: Carefully reassemble the cowl panel, trim pieces, and wiper arms, ensuring everything is properly seated and secured.
8. Reconnect the Battery: Reconnect the positive (+) battery terminal.
9. Test the Wipers: Turn on your wipers to ensure they function correctly.
Important Considerations:
* Repair Manual: A repair manual specific to your 2002 Mercury Grand Marquis is essential. It will provide detailed diagrams, torque specifications, and step-by-step instructions tailored to your vehicle.
* Safety First: Always disconnect the battery before starting any electrical work.
* Photography: Take pictures of each step of disassembly. This is invaluable during reassembly.
* Patience: This is not a quick job. Allow ample time to complete the repair correctly.
* Professional Help: If you're not comfortable working on your car yourself, take it to a qualified mechanic.
This is a general overview. The specifics will vary depending on your vehicle's configuration. Do not attempt this repair without consulting a repair manual. Improperly replacing the wiper motor could damage other components or lead to electrical problems.
