Tools You'll Need:
* New serpentine belt: Make sure you get the correct size and type for your Bonneville. Your parts store can help you identify this based on your VIN or engine code.
* Wrench(es): You'll likely need various sizes, possibly including a socket wrench set and a ratchet. The specific sizes depend on the tensioner and other pulleys.
* Socket extensions and possibly a universal joint: To reach those hard-to-get-to bolts.
* Pliers or channel-locks: May be needed to help maneuver the belt.
* Jack and jack stands (highly recommended): To safely lift the vehicle and provide stable support. Never work under a vehicle supported only by a jack.
* Gloves: To protect your hands.
* Shop rags or paper towels: To clean up any spilled fluids or grease.
Steps:
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels. Raise the vehicle using a jack and secure it with jack stands. This is crucial for your safety.
2. Locate the Serpentine Belt: Identify the serpentine belt that runs around the crankshaft pulley, water pump, alternator, power steering pump, and other accessories.
3. Identify the Belt Tensioner: The tensioner is a pulley with a mechanism to adjust belt tension. It usually has a bolt or lever to release tension.
4. Release Belt Tension: This is the most crucial part and will vary slightly depending on your specific engine. Usually, you will need to loosen the tensioner bolt (often a 13mm or 15mm bolt, but check your manual) while simultaneously using a wrench, or sometimes a long screwdriver, to push or pull the tensioner to relieve pressure on the belt. This is where your vehicle's repair manual will be most useful. The tensioner may swing or pivot; observe how it works before attempting to loosen the bolt. Some tensioners use a lever that is pressed or rotated.
5. Remove the Old Belt: Once the tension is released, carefully slip the old belt off the pulleys. It may require some wiggling and maneuvering.
6. Install the New Belt: Carefully route the new belt onto the pulleys in the same order as the old belt. Ensure the belt sits correctly in all grooves.
7. Re-tighten the Tensioner: Once the new belt is installed, slowly tighten the tensioner bolt or lever, restoring the tension on the belt. Do not overtighten.
8. Check Belt Alignment: Visually inspect the belt to ensure it's properly seated on all the pulleys and is not rubbing against anything.
9. Lower the Vehicle: Carefully lower the vehicle using the jack.
10. Start the Engine: Start the engine and listen for any squealing or unusual noises. If you hear squealing, the belt tension may need adjustment. Also, check for any leaks.
11. Double-Check: After a short run, carefully check the belt and all pulleys for proper alignment, tightness, and wear.
Important Considerations:
* Diagram: Before you start, take a picture or find a diagram showing the serpentine belt routing. This will be extremely helpful during reinstallation.
* Torque Specifications: Use a torque wrench to tighten the tensioner bolt to the manufacturer's recommended specifications (found in your repair manual). Over-tightening can damage the tensioner or other components.
* If Unsure, Seek Professional Help: If you're uncomfortable performing this repair, take your car to a qualified mechanic. Incorrect installation can lead to significant damage.
This is a general guide. The specific procedures might vary slightly depending on the exact engine in your 1995 Pontiac Bonneville. Always refer to your vehicle's repair manual for detailed instructions and safety precautions. Remember safety is paramount. If you are not comfortable working on your car, it is always best to seek professional help.
