On a 1997 Chevy full-size van (likely a G-series van like a 1500, 2500, or 3500), the starter is typically located on the
passenger side of the engine, towards the
bottom. It's usually somewhat difficult to access and often requires removing some components (like the exhaust downpipe or some heat shielding) to get a good view and reach it.
Because of its location and the various engine options available in those vans, a picture of your specific engine bay would make pinpointing it much easier. However, the passenger side, lower engine area is your best starting point for the search.
