Most likely locations:
* Underhood fuse box: This is the most common place. The fuse box is usually located in the engine compartment, often near the battery. The AC relay will be within this box, and it's often a larger relay than most others. Look for relays that are clearly labeled or check your owner's manual's fuse box diagram.
* Inside the cabin fuse box (less likely): Some S10s might have the AC relay inside the cabin fuse box, usually located under the dashboard. Again, consult the owner's manual's diagram.
* On the AC compressor itself (rare): While less common, some vehicles might have the relay mounted directly on the AC compressor.
Identifying the AC relay:
* Your owner's manual: This is the best place to start. The manual will have a diagram of the fuse and relay boxes, showing their locations and what each relay controls.
* Visual inspection: Once you locate the fuse boxes, look for a relay that's larger than the others. Sometimes they're labeled "A/C" or have a similar designation.
* Testing with a multimeter (advanced): If you can't find it visually, you can use a multimeter to test relays to see which one is activated when you turn on the AC. This requires some electrical knowledge and is not recommended unless you're comfortable with automotive electrical systems.
Recommendation: Start with your owner's manual. It's the most reliable source for the exact location of your AC relay. If you don't have the manual, you can usually find a digital version online by searching for "[your year] [your model] owner's manual PDF".
