Generally, you will need:
* A wrench or socket: The size will vary depending on the tensioner; it's usually a 15mm or 13mm. Check your owner's manual or a repair manual specific to your car's engine for the correct size.
* A ratchet (optional but helpful): This makes using the wrench or socket easier.
* Gloves: To protect your hands.
* Shop rags: To clean up any spilled fluids.
* Possibly a jack and jack stands: Depending on access to the tensioner, you might need to lift the car for better clearance. *Always use jack stands for safety when working under a raised vehicle.*
Steps (General Procedure):
1. Locate the Belt Tensioner: The tensioner is usually a pulley with a mechanism to move it. It's likely located near the alternator or power steering pump. Consult a repair manual or online diagrams specific to your engine (3.8L or 3.1L) to pinpoint its exact location. Pictures are invaluable here!
2. Identify the Tensioner Adjustment Mechanism: This is usually a bolt or a lever. Some tensioners use a bolt that you rotate to relieve tension. Others might have a lever that needs to be pressed or moved. Again, a repair manual will clearly show you this.
3. Loosen the Tensioner: Using the appropriate wrench or socket, carefully turn the bolt (clockwise usually *tightens*, counterclockwise usually *loosens*) or manipulate the lever on the tensioner. This will release the tension on the serpentine belt. You may need to apply some force. Be careful; it may spring back when released, so have the belt ready to remove.
4. Remove the Belt: Once the tension is relieved, you can carefully slide the belt off the pulleys.
5. Reassembly is the reverse of removal: Once you've replaced the belt, simply reverse the process to tighten the tensioner.
Important Considerations:
* Repair Manual: A repair manual specific to your 2000 Buick LeSabre (with either the 3.1L or 3.8L engine) is highly recommended. It will show you exactly where the tensioner is, what tool to use, and the correct procedure. Online repair manuals (like those from Haynes or Chilton) are available.
* Safety First: Always work in a well-ventilated area. Disconnect the negative battery terminal before beginning any work on the electrical system. If you're not comfortable performing this task, take your car to a qualified mechanic.
Without knowing the specific engine (3.1L or 3.8L), I can only give you a general overview. Finding a repair manual or diagram for your specific engine is the key to success and safety.
