Re: 2002 Ranger 2.3L coolant temp gage not working
Check this , might help .
" The gauge sending unit is on the metal coolant pipe on the rear passenger side of the engine. The top hose going to the radiator goes toward the back of the engine then becomes a metal pipe just as it turns to go behind the engine. After it goes behind the engine the sensor is there. Fairly hard to get to, but I think it is possible. The only way I could find it is by looking in the manual at the engine exploded view and it showed it behind the engine not far from the EGR valve.
Then the cylinder head temp sensor is right on top in the middle of the spark plugs. Fairly easy to see, but looks hard to get too and looks like something that would break easily. "