Tools you'll likely need:
* New alternator belt: Make sure you have the correct size. Your owner's manual or a parts store can help you find this information.
* Wrench(es): You'll need the appropriate size(s) to loosen and tighten the alternator mounting bolt(s) and any other tensioners.
* Socket set: Helpful for easier access and better grip.
* Ratchet: To turn the wrenches and sockets.
* Gloves: To protect your hands.
* Jack and jack stands (optional but recommended): For easier access to the belt, though sometimes not absolutely necessary. Never work under a car supported only by a jack.
General Steps (This may NOT be exactly the same for your Grand AM):
1. Safety First: Disconnect the negative battery terminal to prevent accidental shorts. Park on a level surface and engage the parking brake.
2. Identify the Belt Route: Carefully inspect the old belt to understand its path around the crankshaft pulley, alternator pulley, power steering pump pulley (if applicable), and any other pulleys. Take a picture if needed.
3. Loosen the Alternator: Most Grand AMs have an alternator with a tensioner pulley. You'll need to loosen the alternator's mounting bolt to create slack in the belt. This usually involves turning the bolt counter-clockwise. The exact location and method may vary; consult your repair manual.
4. Remove the Old Belt: Once there's enough slack, carefully slip the old belt off the pulleys, following the path you observed earlier.
5. Install the New Belt: Route the new belt onto the pulleys in the same order as the old one. Make sure it sits correctly in the grooves of each pulley.
6. Tighten the Alternator: Once the new belt is installed, carefully tighten the alternator mounting bolt to restore tension on the belt. The belt should be snug but not overly tight. Too much tension can damage the belt and bearings, while too little tension can cause slippage. Again, consult your manual for the correct tension.
7. Check Tension (if possible): Some tensioners have a convenient way to check the belt tension (e.g., a gauge or a specified deflection). Your repair manual will guide you on this.
8. Reconnect the Battery: Re-attach the negative battery terminal.
9. Start the Engine: Briefly start the engine and check for any squealing or other unusual noises. If you hear squealing, the belt is likely too loose or misaligned. If the noise persists, recheck the belt routing and tension.
Important Considerations:
* Belt Tension: This is crucial. Too loose, and the belt will slip, leading to charging problems. Too tight, and you risk damaging the alternator or other components.
* Specific Year and Engine: The exact procedure can change depending on the year of your Grand AM and the engine type (e.g., 2.4L, 3.1L, 3.4L, V6).
* Repair Manual: This is your best resource. Download a free copy or purchase a physical one from a reputable auto parts store or online retailer.
If you're uncomfortable performing this task yourself, it's best to take your Grand AM to a qualified mechanic. Replacing a serpentine belt is usually inexpensive, and a professional can ensure it's done correctly.
