What tool do you need to pull off the magnetic clutch hub for ac compressor on a 97 Lumina?

You'll need a clutch pulley puller specifically designed for AC compressors. A generic puller *might* work, but the design of AC compressor clutch hubs often requires a puller with the correct size and shape to grip the clutch without damaging it. Using the wrong tool risks damaging the compressor.

You might find it easier to locate a puller that's specifically identified as being compatible with GM vehicles or even a 1997 Lumina. Checking auto parts stores (both online and brick-and-mortar) for a "clutch pulley puller" or an "AC compressor clutch puller" for a GM vehicle will provide you with the best results.