Tools you'll likely need:
* New serpentine belt: Make sure you get the correct size and type for your Alero's engine. The part number is crucial here, so check your owner's manual or an auto parts store website using your VIN.
* Socket wrench set: You'll need various sizes, probably including metric.
* Wrench set: Again, metric sizes are likely needed.
* Jack and jack stands: Essential for safe working conditions. Never work under a car supported only by a jack.
* Wheel chocks: To prevent the car from rolling.
* Ratchet and extensions: To reach tight spots.
* Gloves: To protect your hands.
* Pliers or needle-nose pliers: May be helpful for maneuvering the belt.
* Shop rag or paper towels: To clean up any spilled fluids.
* Optional: Belt tensioner tool: This tool can make the job significantly easier, but it's often possible to do without it with a bit of ingenuity.
Steps:
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels. Jack up the front of the car and securely support it on jack stands. Disconnect the negative battery terminal.
2. Locate the Serpentine Belt: Identify the serpentine belt. It's the single, long belt that runs around various pulleys on your engine.
3. Identify the Tensioner: Locate the belt tensioner pulley. This pulley is used to create tension on the belt, making it easier to remove and install. It usually has a bolt or lever that needs to be manipulated to release tension. Your repair manual will show you exactly where it is.
4. Release Belt Tension: This is the trickiest part. You'll need to use a wrench or the special tensioner tool to loosen the tensioner pulley. This will allow you to slip the belt off the pulleys. Be careful, the tensioner will spring back when released, so be prepared to quickly remove the belt.
5. Remove the Old Belt: Once the tension is released, carefully work the belt off each pulley. It may help to start at the tensioner pulley.
6. Install the New Belt: Carefully route the new belt around all the pulleys in the same order as the old one. Make sure it sits correctly in all the grooves. Your repair manual will likely have a diagram showing the correct routing.
7. Tighten the Tensioner: Slowly release the tensioner, allowing it to grip the new belt. Ensure the belt is properly seated on all pulleys.
8. Check Belt Alignment and Tension: Visually inspect the belt to make sure it's correctly aligned and has proper tension. There should be a slight give when you press on it, but not so much that it's loose or floppy.
9. Lower the Vehicle: Carefully lower the vehicle to the ground.
10. Reconnect Battery Terminal: Reconnect the negative battery terminal.
11. Test Run: Start the engine and listen for any squealing or unusual noises. If you hear any, double-check your work, paying close attention to belt alignment and tension.
Important Notes:
* Repair Manual: A factory service manual for your specific 1999 Oldsmobile Alero is invaluable. It will provide detailed diagrams, torque specifications, and step-by-step instructions.
* Pictures: Before you start, take pictures of the belt routing. This will be helpful when reinstalling the new belt.
* Difficulty: While this is generally a doable DIY job, if you're uncomfortable working on your car or aren't mechanically inclined, it's best to take it to a professional mechanic. Improper installation can lead to belt slippage, damage to other components, or even engine damage.
This guide provides a general overview. Always consult your vehicle's repair manual for detailed instructions specific to your car's make, model, and engine. Be safe and take your time!
