To be certain:
1. Consult your vehicle's repair manual: This is the best resource for the exact location and identification of each sensor. A Haynes or Chilton manual would be helpful.
2. Look near the thermostat housing: This is the most common location for at least one of the sensors. It's a relatively accessible area.
3. Look for a sensor with one or two wires: The gauge sensor usually has one or two wires, while the ECM sensor typically has two.
4. Use a diagram: An online parts diagram for your specific year and engine can help pinpoint the location. Many auto parts websites offer these diagrams. You'll likely need your VIN to ensure accuracy.
Caution: The coolant will be hot when the engine is running. Allow the engine to cool completely before attempting any work near the coolant system.
