Tools You'll Need:
* New alternator belt: Make sure you get the correct size belt for your specific engine.
* Socket wrench and sockets: You'll likely need sockets to loosen and tighten the various belt tensioners. The sizes will depend on your vehicle.
* Wrench: Possibly a wrench for some tensioners, depending on your car's design.
* Ratchet: To quickly turn sockets.
* Gloves: Protect your hands.
* Jack and jack stands (optional but highly recommended): Safely lifting the front end of your car improves access.
Steps (General):
1. Safety First: Engage the parking brake firmly and chock the wheels. If you're working under the car, use jack stands. Never work under a vehicle supported only by a jack.
2. Locate the Alternator and Tensioner: Identify the alternator and the belt tensioner(s). The tensioner is a mechanism (usually a pulley with a spring or hydraulic mechanism) that allows you to loosen the belt. It might be located on the crankshaft pulley or near the alternator.
3. Loosen the Tensioner: This is the crucial step. You'll need to use the correct wrench or socket to loosen the tensioner. The method varies depending on the tensioner design:
* Some tensioners require turning a bolt: Turning this bolt will release the tension on the belt.
* Others might have a lever or a hydraulic mechanism: You may need to use a special tool or a long bar to manipulate the lever to relieve tension.
4. Remove the Old Belt: Once the tension is released, the belt should be loose enough to slip off the pulleys. Work the belt off each pulley, one at a time.
5. Install the New Belt: Carefully route the new belt around all the pulleys, ensuring it sits correctly in the grooves. The routing should follow the same path as the old belt. Refer to a diagram in your repair manual if unsure.
6. Tighten the Tensioner: Once the new belt is on, carefully tighten the tensioner bolt or lever, restoring tension to the belt.
7. Check Belt Tension: After tightening, check the tension of the belt. It should be snug but not overly tight. You should be able to deflect it with moderate thumb pressure (about ½ to ¾ inch of deflection). Consult your repair manual for specific tension guidelines. An improperly tensioned belt can cause premature wear and damage.
8. Start the Engine: Start the engine and check for any squealing noises, which indicate incorrect belt tension or routing. If you hear squealing, stop immediately and recheck your work.
9. Lower the Vehicle (if applicable): If you raised the car, slowly lower it to the ground.
Important Considerations:
* Consult your repair manual: This is absolutely crucial. The exact procedure, tool sizes, and tensioner type will vary depending on your specific Grand Prix model and engine.
* Take photos: Before you start, take pictures of the belt routing to avoid mistakes during reassembly.
* Don't force anything: If you encounter resistance, stop and re-evaluate your approach. Forcing components can cause damage.
* If unsure, seek professional help: If you're uncomfortable performing this repair yourself, take your Grand Prix to a qualified mechanic.
This is a general guide; the specifics will depend on your vehicle. Always prioritize safety and consult your repair manual for the most accurate and safe procedure.
