Your best bet is to:
1. Consult your owner's manual: This is the most reliable source. The manual should have a diagram of fuse and relay locations.
2. Check the fuse box under the hood: Most Prizms have the main fuse and relay box under the hood, typically near the battery. Look for a diagram on the inside of the fuse box lid. It may show the A/C relay location, or at least help you identify relays. Many are labeled.
3. Check the fuse box inside the car (if applicable): Some models might have a secondary fuse box inside the cabin, often near the steering column or under the dash. Check this as well.
4. Use a wiring diagram: A wiring diagram specific to your 2002 Chevy Prizm (available online from repair manuals or some automotive parts websites) will show the exact location and circuit for the A/C relay. This is the most definitive method but requires more technical knowledge.
Remember, always disconnect the negative battery terminal before working with electrical components to prevent short circuits and damage. If you're not comfortable working with automotive electrical systems, it's best to take your vehicle to a qualified mechanic.
