* Under the hood in the fuse box: This is the most common location. The fuse box is usually near the battery. Look for a relay that's labeled "A/C," "AC compressor," or has a similar designation. Some fuse boxes have diagrams on their inside cover to help you identify the relay.
* Under the dash: Less common, but possible. You might find it near the other relays and fuses under the dashboard.
To find it reliably:
1. Consult your owner's manual: This is the best resource. It should have a diagram showing the location of all fuses and relays.
2. Check online forums: Search for "1991 Chevy S10 AC relay location" on forums like Chevrolet-specific websites or general automotive forums. Someone with a similar model year truck might have already documented the location.
3. Trace the wiring: If you're comfortable working with electrical systems, you could follow the wiring from the AC compressor back to find the relay. Caution: This should only be done by someone with experience in automotive electrical systems, as improperly working with car wiring can be dangerous.
Remember to always disconnect the negative battery terminal before working on your vehicle's electrical system.
