I think your best bet would be to get a haynes manual for gm cars. i just got one for my lesabre to do some work on it and it has great detailed instructions and wonderful pictures and diagrams. u can order them online. just go to haynes.com and select your car
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On the underside of the hood or on the radiator shroud there should be a decal showing the routing of the belt for the engine that came in the car. The tensioner pulley (should be designated on the decal) will need to be moved to remove the old one and to reinstall the new.
I found the diagram in my owner's manual.
I replaced the belt on mine just 2 days ago. All you need to do is remove one bolt from the lower motor mount and remove the spacer. After you relieve the belt tensioner, the belt will slip right through the gap. Don't forget to support the engine before removing the bolt. As a backup I took a photo of the belt with my digital camera beforehand... just in case.
This is a 99 lesabre? You don't have to remove the mount. Look in through the wheel well and remove the nut on the mount that is between the crank pulley and the a/c compressor. After you remove the nut, remove the stud with an inverted torx bit. When you remove the stud, the spacer between the mount and the block will come out and then you can change the belt.