Which side of the car is the starter located under the car?

First thing is to check the easy things making sure all battery cables are clean and tight, including the one down at the starter. Oh, the cable down at the starter will be hot (powered) so you want to disconnect the negative cable from the battery before working down at the starter. The starter can be hidden and I had a time locating it when I had to change out my starter. The starter on a 1993 LeSabre is at the front of the engine on the driver side. The front cross-member of the engine cradle blocks it partially from view. There is a grit cover that I think is made into the cover that covers the lower part of the trans flywheel. On mine it had been broken and just sitting in place. You do want a grit cover in place when you reinstall the starter. The trick to reinstalling the starter if you are doing the job alone is to use a block of wood to wedge the starter up against the engine so you can then align the bolts (you may not have any trouble, but my arms are not as strong and I could not hold the starter in place long enough to get the bolts aligned).