Defective temperature sensor or bad gauge
look under the throttle body on the front of the engine there s a sensor with 3 wires going to it that is the engine coolant temperature sensor
Thermostat stuck open or no stat at all. Faulty temp sensor or Gauge.
THE temp sending unit 4 the inside gauge usally has 1 wire & the sending unit 4 the Computer has 2 wires.
Temp sensor for the gauge.
probably the sensor
Bad gauge and/or coolant temp sensor The coolant temp sensor doesn't control the gauge. There is a sensor in the head on the driver's side that controls the gauge. It is fairly easy to get to, probably one of the only things on a 4th gen. lol
The coolant gauge temp sensor is a one wire sensor located on the right rear of the engine block.
The temp sending unit for the temp gauge is located on the drivers side of the engine between cylinders 3 and 5 spark plugs.
Defective temperature gauge or defective temperature sensor?
Could be you have a temp sensor for the ECM and a temp sender for the gauge. The gauge sender generally has one wire attached to it. The temp sensor generally has two wires attached to it. Perhaps you changed the wrong one.
Test gauge function with a mechanical gauge to get actual engine temp.