Drive belt? the serpentine belt? if that's what your talking about check the grooves in the underside of the belt if good check your tensioner to make sure it has enough strength to keep the belt tight
When pulling up hill the belt slips!
Disconnect the 98 LeSabre battery. Remove the alternator belt. Remove the alternator wiring. unbolt the alternator, remove it, and bolt the new one on. Reconnect the wiring, but the belt on, then reconnect the battery.
need a diagram off drive belt on 1998 barina
Put the belt tensioner tool on the tensioner pulley, and push away from you. Then you can slide the belt off. You either need to cut it or unbolt the engine from its mount and slip it out.
it has a timing belt
by hand
Well if it looks anything like my Skylark, then that motor mount has to come out. Make sure you support the engine with a jack and block of wood when you pull it. I just changed mine on my LeSabre yesterday and that is exactly how I did it. I also removed the right passenger tire for easier access to the motor mount.
All you need is a 3/8" drive ratchet to take the tension off the spring loaded pulley that tensions the belt. Remove old belt and put new one on, it is a little awkward because one hand needs to hold the wrench and the other hand slips the belt over the tensioning pulley but it is easy. Takes 5-10 minutes.
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the LeSabre has a timing CHAIN. It does not need to be replaced. (unless you broke it :)
Disconnect the negative battery cable.Raise the vehicle.Remove the front lower splash shield.Drain the coolant by opening draincock in radiator.Close the radiator draincock.Install the front splash shield.Lower the vehicle.Remove the accessory drive belt.Remove the generator.Remove the heater hoses.Remove the drive belt tensioner boltsRemove the drive belt tensioner.Reverse procedure to install.