What are the step by step instructions for replacement of gm part number 24503423 for a 1999 grand prix gtp from the tensioner end and what tools are needed for each step?

To replace GM part number 24503423 (the tensioner) on a 1999 Grand Prix GTP, follow these steps:

1. Tools Needed: Ratchet and socket set, torque wrench, and possibly a breaker bar.
2. Remove Accessories: Disconnect the negative battery terminal. Then, use the ratchet to remove the serpentine belt by releasing tension from the tensioner using a wrench on the tensioner pulley bolt.
3. Unbolt Tensioner: Use the ratchet and appropriate socket to remove the bolts securing the tensioner to the engine block.
4. Install New Tensioner: Position the new tensioner in place and secure it with the bolts. Torque the bolts to the manufacturer's specifications. Reinstall the serpentine belt, ensuring proper routing, and reconnect the battery terminal.

Make sure to consult a repair manual for specific torque specifications and additional details.