To find the relevant fuses and relays, you'll need to consult your owner's manual. It will have a diagram showing the fuse box layouts and which fuse(s) are associated with the A/C compressor, blower motor, and other AC components. Look for fuses labeled "A/C," "Compressor," "Blower," or similar terms. You might also find a relay controlling the compressor clutch.
If you don't have the owner's manual, you can often find a downloadable version online through the Chevrolet website or a site like Haynes Manuals. Remember to always disconnect the negative battery terminal before working on the electrical system.