Engine Coolant Temperature Gauge
WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, and 2005 Ford E450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster receives information on the engine coolant temperature from the PCM over the communication network. When the engine coolant temperature is within normal operating range, the gauge needle will be in the normal range.