1. Identify Your Tensioner:
* Look for a tensioner pulley: This is a pulley that's not directly connected to the alternator or other driven components. It has some sort of mechanism to adjust tension. It will often have a bolt or a lever arm. This is the crucial part you need to manipulate.
* Automatic Tensioner (Most Common): These usually have a pivoting arm and will use a long bolt or a special tool to relieve tension.
* Manual Tensioner (Less Common): These require you to use a wrench or socket to turn a bolt or nut to release tension on the belt.
2. Gather Your Tools:
* Wrench(es) or socket(s): Sizes will vary depending on your Suburban's model year and engine. Consult your owner's manual or a repair manual for the correct sizes.
* Jack and Jack Stands (Highly Recommended): Working under a raised vehicle is much safer. Never work under a vehicle supported only by a jack.
* Gloves: Protect your hands.
* Ratchet and extensions (if needed): To reach the tensioner bolt easily.
* Shop rags or paper towels: Clean up any spills.
* New Alternator: Obviously!
3. Loosen the Belt (General Steps):
A. Automatic Tensioner (Most Common):
1. Locate the tensioner: Identify the tensioner pulley. It's usually near the alternator.
2. Identify the access point: There's typically a long bolt or a specifically designed tool access point on the tensioner.
3. Loosen the tensioner: Use the appropriate wrench or socket to turn the tensioner bolt counter-clockwise. This will relieve tension on the belt. You might need to apply significant force.
4. Remove the belt: While the tension is released, use a flat-head screwdriver or your fingers to carefully pry the belt off the alternator pulley.
B. Manual Tensioner (Less Common):
1. Locate the tensioner: This may involve moving some accessories out of the way to access it.
2. Use a wrench: Use the appropriate wrench to turn the tensioner bolt or nut in the direction that loosens tension on the belt. You might need to apply significant force.
3. Remove the belt: Once the tension is released, carefully remove the belt from the alternator pulley.
4. Replacing the Alternator:
Once the belt is off, you can proceed to remove and replace the alternator. This usually involves removing several bolts and disconnecting electrical connectors. Refer to a repair manual specific to your Suburban's year and engine for detailed instructions on alternator removal and installation.
5. Reinstalling the Belt:
1. Route the belt: Carefully route the belt back onto all the pulleys in the correct order. Use a diagram or the old belt as a guide.
2. Tighten the tensioner: Slowly tighten the tensioner bolt back to its original position. Make sure the belt is snug but not overly tight.
3. Check belt tension: If your belt routing is correct but there's still too much tension, something is preventing the belt from seating correctly. If too little, your belt will slip and can cause damage. The tension should allow a slight flex on the longest span.
IMPORTANT NOTES:
* Consult a Repair Manual: This is the most critical step. A repair manual specific to your Suburban's year, make, and engine will provide detailed diagrams, torque specifications, and step-by-step instructions. This will avoid damage to your vehicle and ensure safety.
* Safety First: Always use jack stands and work in a well-ventilated area. Disconnect the negative battery terminal before starting any work.
* Torque Specifications: Always tighten bolts to the manufacturer's specified torque. Using too much or too little torque can damage components.
If you're not comfortable performing this repair yourself, take your Suburban to a qualified mechanic. It's better to be safe than sorry, especially when working with potentially dangerous moving parts.
