Where is the AC relay located on a 1998 Cadillac DeVille?

The AC relay location on a 1998 Cadillac DeVille isn't standardized in one single place across all models. It's usually found within one of the underhood fuse/relay boxes. To locate it precisely:

1. Consult your owner's manual: This is the best place to start. The manual should have a diagram of the fuse box(es) showing the relay locations.

2. Check the underhood fuse boxes: There are typically one or two fuse boxes under the hood. They're usually located near the battery or along the firewall. Carefully open the box and examine the diagrams on the inside of the cover. Look for a relay labeled "A/C," "AC Compressor," or something similar. The diagrams may use a symbol to represent the AC compressor relay.

3. Look for a relay that's relatively large: The AC compressor relay is usually a bit larger than the other relays.

4. Use an online parts diagram: Websites like AutoZone, Advance Auto Parts, or RockAuto have online parts diagrams. Select your specific 1998 Cadillac DeVille model (the exact trim level is important) and look at the diagrams for the fuse boxes. This will show you precisely where the AC relay should be located.

Important Note: Working with electrical components in a car can be dangerous. If you're not comfortable working with car electrical systems, it's best to have a qualified mechanic diagnose and repair any AC issues.