1. Locate the Tensioner:
* Most common scenario: The serpentine belt tensioner is usually located near the alternator, often on the bottom or side. It might have a spring mechanism and a pulley. It will be a clearly identifiable component. Consult a repair manual or online diagrams specific to your engine for the precise location.
* Automatic tensioner: This type uses a hydraulic or spring-loaded mechanism. You won't need to manually push or hold anything while loosening the belt.
* Manual tensioner: This type requires you to manually push or pull a lever or pulley to relieve tension.
2. Access the Tensioner:
* You'll likely need to use a socket or wrench to access the tensioner, depending on the design of your specific tensioner. You might need to remove other components to gain sufficient access – consult your repair manual.
3. Loosen the Belt Tension:
* Automatic Tensioner: Use a wrench or ratchet to rotate the tensioner pulley in the *correct* direction. This will usually be counter-clockwise (viewed from the front of the engine) to release the belt tension. Only rotate it enough to allow you to remove the belt, then immediately release the wrench as the tensioner spring will try to quickly retract.
* Manual Tensioner: There will usually be a bolt you can use a wrench or ratchet on to release the tensioner. This may require you to hold the tensioner in the released position while removing the belt. If it's a lever-type, use the lever to push or pull to create slack in the belt. You'll likely need to hold it in place while removing the belt.
4. Remove the Serpentine Belt:
Once the tension is released, you should be able to easily remove the serpentine belt by lifting it off the pulleys. Work your way around the engine, starting from the alternator pulley.
5. Replace the Alternator:
After removing the belt, you can then disconnect the alternator's wiring and mounting bolts, allowing you to remove and replace the alternator. Remember to reverse the procedure to reinstall the alternator.
6. Reinstall the Serpentine Belt and Tighten Tensioner:
After installing the new alternator, route the serpentine belt back around the pulleys in the correct sequence (consult your repair manual or diagrams). Then, release the tensioner (if you were holding it) and let it return to the normal position. Ensure the belt is properly seated on all pulleys.
Important Considerations:
* Repair Manual: A repair manual specific to your 2000 Jeep Grand Cherokee's engine is highly recommended. It will provide detailed diagrams, torque specifications, and the exact procedure for your vehicle.
* Safety: Disconnect the negative battery terminal before starting any work. Use jack stands and proper safety precautions when working under the vehicle.
* Tools: You will likely need various sockets, wrenches, a ratchet, and possibly a serpentine belt tool (though often not necessary).
If you're not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Incorrectly tightening the belt tensioner can lead to premature belt wear and potentially damage to other engine components.
