My 02' 5.4l has been showing a low coolant code for some time. A year a go i replaced the thermostat and a sensor that was under the intake manifold (that was a B....). I believe that there is still another sensor but i'm not sure where it is on the engine block. Any advise out there?

 

I ran a OBD test, threw code P0125. Fault-"Coolant Temp Sensor". Still not sure where this is on the engine?

 

Twards the front of the intake manafold with a plug and a coolant line into it it threads into the intake

 

Turns out there is only one sensor on some (earlyier?) models. Up under the intake manifold. Bitch to replace. Still looking for problem, thinking maybe the clutch on the fan is not disengaging.