To be certain:
1. Consult your owner's manual: This is the best resource, as it will show the exact location for your specific vehicle.
2. Look at a repair manual (Chilton's or Haynes): These manuals have diagrams showing the location of all sensors.
3. Visual inspection: With the engine cool, carefully examine the intake manifold. Look for a sensor with a single wire connector near the thermostat housing. It will likely be a small sensor with a threaded body.
Caution: The engine and coolant will be hot if the engine has recently been running. Allow it to cool completely before attempting to locate the sensor.