1. Preparation:
* Disconnect the battery: This is a crucial safety step to prevent accidental short circuits.
* Park the vehicle: Ensure the vehicle is parked on a level surface and the parking brake is engaged.
* Gather tools: You'll likely need a wiper arm puller (highly recommended to avoid damage), or potentially a pair of pliers (use caution!). Some might use a flat-head screwdriver, but this is riskier.
2. Locating the Wiper Arm Nut:
* Inspect the wiper arm: Look closely at the base of the wiper arm where it connects to the wiper arm shaft. There's usually a nut or a retaining clip hidden underneath a small plastic cap or cover. You might need to carefully pry off this cap to reveal the fastener.
3. Removing the Wiper Arm:
* Using a Wiper Arm Puller: This is the safest method. Position the puller's claws around the wiper arm base, ensuring a secure grip. Then, gently tighten the puller's nut or bolt to pull the arm free from the shaft.
* Using Pliers (Less Recommended): If you don't have a puller, you can *carefully* try to use pliers to grip the wiper arm close to the shaft. Apply even pressure and gently wiggle the arm while pulling. Be extremely cautious not to scratch the paint or damage the wiper arm. A rag wrapped around the pliers will help prevent scratches.
4. Removing the Wiper Blade:
The wiper blade itself is typically disconnected after removing the arm. There's usually a hook or a button release mechanism on the arm that allows you to detach the blade. Refer to the instructions on your specific wiper blade type.
Important Considerations:
* Model Specifics: The exact method might vary slightly depending on the specific 1991 Chevy model (e.g., Cavalier, Silverado, Suburban). Consult a repair manual specific to your year and model for the most accurate instructions.
* Corrosion: If the nut or the arm is rusted or seized, applying penetrating oil (like PB Blaster) several hours in advance can help loosen it.
* Damage: Use caution to avoid damaging the wiper arm or the shaft. If you're uncomfortable, it's best to take it to a mechanic.
* Orientation: Take note of the wiper arm's position before removing it. This will help you reinstall it correctly.
Disclaimer: This information is for general guidance only. Improper procedures can lead to damage. Always consult a repair manual specific to your vehicle or seek professional help if you are unsure.
