* Under the hood in the fuse box: This is the most common location. The fuse box is usually located near the battery, often on the fender well. Look inside the fuse box itself for a relay labeled "cooling fan" or a similar designation. You might need to consult the owner's manual's fuse box diagram to identify the correct relay.
* Under the dash: Less common, but possible. This would be in a fuse box or relay panel under the dashboard. Again, your owner's manual is key.
To find it definitively:
1. Consult your owner's manual: This is the best resource. The manual will have a diagram of the fuse and relay boxes showing the location and function of each relay.
2. Use a wiring diagram: If you can't find the information in your owner's manual or if the diagram is unclear, obtain a wiring diagram specifically for your 1993 Pontiac Sunbird 4-cylinder. These are available online through various automotive repair resource websites (often for a fee). The diagram will show the relay's location and its connection to the cooling fan.
3. Visual Inspection (with caution): Carefully examine the fuse and relay boxes, looking for a relay of appropriate size that seems like it might control a high-amperage device like a cooling fan. Be careful not to touch anything while the engine is running.
Remember to always disconnect the negative battery cable before working with electrical components to prevent accidental shocks or short circuits.
