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Which engine do you have?
The Engine Coolant Temperature sensor can be found near the thermostat housing or close to where the upper radiator hose attaches to the intake manifold. Good luck.
on the front, top of the engine. look near the upper coolant hose on the engine for a sensor with a couple of wires on it. There may be 2 in close proximity that look similar.
The Cylinder Head Temperature (CHT) sensor for the 2.3L engine is located between the two center ignition coils. The Engine Coolant Temperature (ECT) sensor for the 3.0L engine is located in the intake manifold to the right of the thermostat housing. The Engine Coolant Temperature (ECT) sensor for the 4.0L engine is located in the intake manifold behind the thermostat housing.
on top of the engine on the hose that outlets from the pipe going to the thermostat. it has two spade terminals and is easy to access right there in the middle of the engine bay
On a 2002 Ford Ranger : The check " gage " light comes on if : The engine coolant temperature is TOO HIGH The engine oil pressure is TOO LOW or The fuel gauge is at or near empty
You drain coolant from the radiator. but according to the book ther are two plugs on the engine block that need to drain the coolant from.
The 1998 Ford Ranger Owner Guide shows Ford Extended Life Engine Coolant ( Dexcool )
The check gage light comes on if your engine coolant temperature is high , the oil pressure is low , or the gas tank is almost empty
Either your engine coolant temperature is HIGH , your oil pressure is LOW , or your gas tank is at or near empty
Either your engine coolant temperature is HIGH , your oil pressure is LOW , or your fuel gauge reads at or near empty
On a 2003 Ford Ranger : The 2.3 litre four cylinder engine has a thread on cap on the engine coolant reservoir , that is the pressure cap / radiator cap ----------------------------------------------------------------------------------------------------- On the 3.0 and 4.0 litre V6 engines , I believe there is a radiator cap on the top of the radiator , but with the engine cool you should add engine coolant to the engine coolant reservoir - it has a cold fill mark