* Under the hood in the fuse box: This is the most common location. The fuse box is usually located near the battery. Look inside the fuse box itself for a relay that's labeled as the "radiator fan" or something similar. Consult your owner's manual for a specific diagram showing relay locations.
* Inside the car's fuse box (under the dash): Less common, but possible, especially if it's controlled by the climate control system. Again, your owner's manual will be the best resource here.
To be certain: Consult your owner's manual. It will have a diagram showing the location of all fuses and relays, including the radiator fan relay. This is the most reliable way to find it. The manual will also typically give you a description of what the relay looks like.
