Tools You'll Need:
* New serpentine belt: Make sure you get the correct belt for your specific Avalanche engine. The part number is crucial.
* Socket wrench set: You'll likely need various sizes, including those for the tensioner pulley.
* Wrench set: May be needed in conjunction with the sockets, especially for stubborn bolts or pulleys.
* Ratchet: To make working with sockets easier.
* Jack and jack stands: Essential for safely lifting the vehicle.
* Wheel chocks: To prevent the vehicle from rolling.
* Gloves: To protect your hands.
* Penetrating oil (PB Blaster or similar): To help loosen any stubborn bolts.
* A serpentine belt tensioner tool (highly recommended): This makes releasing the tension on the belt much easier and safer. Failing to use one can lead to injury.
* Work light: To ensure good visibility.
Steps:
1. Safety First: Park on a level surface, engage the parking brake, and use wheel chocks. Raise the front of the Avalanche using a jack and securely support it with jack stands. Never work under a vehicle supported only by a jack.
2. Locate the Serpentine Belt: Identify the serpentine belt running around various pulleys.
3. Identify the Belt Tensioner: This is a pulley with a mechanism to create tension on the belt. It usually has a bolt or other mechanism to release the tension.
4. Release Belt Tension: This is the most critical step. You absolutely need the correct tensioner tool for this. The tool will be used to compress the tensioner, allowing you to release the belt from its pulleys. Attempting this without the tool is very difficult and potentially dangerous, as the tensioner spring can snap back with considerable force.
5. Remove the Old Belt: Once the tension is released, carefully remove the old serpentine belt from the pulleys.
6. Install the New Belt: Carefully route the new belt around all the pulleys in the same order as the old belt. It helps to follow the path of the old belt closely.
7. Release Tensioner Tool: Slowly release the tensioner tool, allowing the tensioner to return to its normal position. The belt should now be properly seated.
8. Check Belt Alignment: Ensure the belt is correctly seated on all pulleys and is not rubbing against anything.
9. Lower the Vehicle: Carefully lower the Avalanche using the jack.
10. Test the Engine: Start the engine and listen for any squealing or unusual noises from the belt.
Important Considerations:
* Diagram: A diagram of the serpentine belt routing is incredibly helpful. You can find one in your owner's manual or online through a parts store website using your vehicle's VIN.
* Tension: The belt needs the correct amount of tension. Too loose, and it will squeal and eventually break. Too tight, and it can put undue stress on the pulleys and bearings. If you don't have a tensioner tool, you risk getting the tension wrong.
* Pulley Alignment: Make sure all pulleys are aligned correctly. Misalignment can damage the belt prematurely.
* Professional Help: If you are uncomfortable performing this task, it's strongly recommended you take your Avalanche to a qualified mechanic. The risk of injury and potential damage to your vehicle is significant if you don't have the necessary experience and tools.
This guide provides a general overview. Always consult your owner's manual and seek professional help if you're unsure about any step. Improperly installing the belt can cause significant damage to your engine.
