I need to replace my serpateen belt how do i do that?

This label shows the accessory belt routing on a Lumina with a 3.1L engine

1. Disconnect the negative battery cable.
   
2. Remove the drive belt shield.
   
3. Fit a 3/8 inch breaker bar or ratchet to the square hole in the tensioner. Lift, or rotate the tensioner off of the drive belt. When the tension on the belt is removed, slide the drive belt from the pulleys.
   

To install:

1. Taking care to follow the proper routing of the belt, slip the belt onto the pulleys. As a help, note that the water pump pulley is usually driven from the back (smooth side) of the belt.
   
2. Fit a 3/8 -inch breaker bar or ratchet to the square hole in the tensioner. Lift, or rotate the tensioner and, with the belt in place, gently release the tensioner.
   
3. Verify that the belt is correctly routed and aligned in the proper grooves of the accessory drive belt pulleys. Inspect the drive belt length scale on the drive belt tensioner for the proper indicated length. If the drive belt length scale does not indicate the proper installed length, the belt may be incorrect, incorrectly installed, worn out or the tensioner may be defective.
   
4. Connect the negative battery cable. Start the vehicle and verify correct operation.
   

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