To access the sensor, you will need to:
1. Remove the air filter housing.
2. Remove the coolant level sensor from the coolant reservoir.
3. Disconnect the electrical connector from the engine coolant temperature sensor.
4. Remove the bolt that secures the sensor to the timing chain cover.
5. Remove the sensor from the timing chain cover.
When reinstalling the sensor, be sure to apply a small amount of sealant to the threads of the bolt to prevent leakage.
Here are some additional tips for replacing the engine coolant temperature sensor on a 2007 Ford Fusion:
* Be sure to allow the engine to cool down completely before performing any work.
* Use a new gasket when reinstalling the sensor.
* Tighten the bolt to the specified torque (10 ft-lbs).
* Verify that the electrical connector is properly seated before starting the engine.
