The owner's manual will show you a fuse box diagram, indicating which fuse is for the blower motor (often labelled as "blower," "heater," or something similar). There's usually an under-hood fuse block and an interior fuse panel (often under the dash). The fuse in question could be in *either* location.
Without your owner's manual, it's impossible to give you a precise location. Searching online for "1997 Jeep Wrangler fuse box diagram" might yield a diagram, but even then, the blower motor's fuse labeling can vary slightly depending on trim level and options.
