On a 1997 Chevy Malibu LS with a 3.1L engine, the A/C compressor is typically located on the
passenger side (right side) of the engine, driven by a serpentine belt. It's usually fairly low down and near the front of the engine. You'll be looking for a fairly large cylindrical component with a clutch pulley on the front.
However, without seeing the specific vehicle, this is a general location. It's best to consult a repair manual specific to your 1997 Chevy Malibu LS 3.1L for a precise diagram and location. A visual inspection of your engine bay is also highly recommended.
