To find it, you have several options:
1. Consult your owner's manual: This is the best first step. The manual should have a fuse and relay diagram showing their locations.
2. Check the underhood fuse box: Many relays are located in the main fuse box under the hood. Look carefully at the diagram on the fuse box cover. It's usually quite detailed.
3. Check the interior fuse box: Some vehicles place relays inside the passenger compartment fuse box (often located under the dashboard). Again, check the diagram on the cover.
4. Use a wiring diagram: You can find wiring diagrams online (often through forums dedicated to Cadillac DeVille DHS or repair manuals) that will pinpoint the relay's location. This requires some electrical knowledge to trace the wires and interpret the diagram.
5. Use a multimeter: With some electrical knowledge, you can trace the blower motor's power wire to find the relay. This method involves testing for power and continuity.
Important Safety Note: Before working with any electrical components, disconnect the negative terminal of your car battery. This will prevent accidental shorts and damage to your vehicle's electrical system.
Because of the variability in relay placement, there's no guarantee a specific location can be given here. The most reliable approach is to use your owner's manual and/or wiring diagrams to identify the location in *your* specific vehicle.
