1. Preparation:
* Gather Tools: You'll need a socket set (likely 10mm, 13mm, and possibly others), screwdrivers (Phillips and flathead), pliers, a wrench, and possibly a ratchet. A shop manual specific to your year and model truck is highly recommended.
* Locate the Wiper Motor: It's typically located under the hood, near the firewall, behind the wiper arms. You might need to remove some components to access it easily.
2. Access the Wiper Motor:
* Remove the Wiper Arms: This is usually done by using a wiper arm puller tool (highly recommended to avoid damage). If you don't have one, you might be able to carefully pry them off with a flathead screwdriver, but be prepared for potential damage. Remember their position for reinstallation.
* Remove Cowl Panel (partially or fully): You will likely need to remove at least a portion of the cowl panel (the plastic cover under the windshield wipers). This often involves removing screws and clips. The extent of removal depends on your truck's specific design.
* Disconnect Electrical Connections: Carefully disconnect the electrical connector(s) leading to the wiper motor. Take pictures or make notes to ensure correct reconnection.
* Disconnect Linkage: The wiper motor is connected to the wiper arms via a linkage. Carefully disconnect this linkage. Again, take notes or photos if needed.
3. Remove the Wiper Motor:
* Remove Mounting Bolts/Nuts: The wiper motor is usually held in place by several bolts or nuts. Carefully remove these, supporting the motor as you go.
4. Install the New Wiper Motor:
* Reverse the Removal Process: Install the new motor by reversing the steps you took to remove the old one. Make sure the linkage is properly connected and the electrical connectors are securely attached.
5. Reassembly:
* Reattach the Cowl Panel: Carefully reinstall the cowl panel, ensuring all screws and clips are properly seated.
* Reattach the Wiper Arms: Reinstall the wiper arms using the wiper arm puller or carefully align them and secure them.
* Reconnect the Battery: Reconnect the negative battery terminal.
6. Testing:
* Test the Wiper Motor: Turn on your wipers to verify proper operation. If they don't work, double-check all connections.
Important Considerations:
* Year and Model Variations: The exact location and access method for the wiper motor can vary depending on the specific 1989 Chevy truck model. A shop manual for your specific truck is crucial.
* Safety: Always disconnect the negative battery terminal before working on electrical components.
* Patience: This is a moderately involved job. Take your time, be careful, and don't rush the process.
If you're not comfortable performing this repair yourself, it's best to take your truck to a qualified mechanic. They have the experience and tools to do the job safely and efficiently.
