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You are not giving a year,make, or model of vehicle, but as a general rule the coolant temp sensor (which many cars use for the fan) and/or the fan sensor are usually located near the water outlet for the upper radiator hose. This is also the location of the thermostat on most vehicles. Hope that helps.
This cooling fan circuit has 2 cooling fans and 2 cooling fan relays, both cooling fan relays are located in the BJB
(battery junction box, underhood fuse box) there is a low speed or main
cooling fan relay in cavity location # K-46 and the high speed relay is
location # K-47! Also check the main cooling fan power fuse # 2 in the
same BJB, The fuse is a MAXI-FUSE (large one) it is blue in color and is
rated at 60amps!
Also check the coolent tempature sensor thats what signals the fan to turn on.
Do the fans turn on when you turn the a/c on. if not may have bad fan motor
If you are refering to the Engine Coolant Temperature (ECT) sensor,it is located on the right rear of the engine below the exhaust gas recirculation (EGR) valve.
HINT: If your Deville is equipped with the analog instrument cluster and the temperature gauge is working, or if you have the digital instrument cluster and the driver information center (DIC) has been diplaying messages telling you that the engine is hot, the problem with your engine cooling fans is NOT the sensor.
Check cooling fan, cooling fan sensor, the sensor's relay if such, coolant level, coolant pump. Sorry for not being able to tell you where are these located, never seen a Ford truck even with closed hood...
Fan Relay switch is stuck open. This of course assumes your temperature
sensor is working appropriately. Which I assumed since you seem to know
that the engine is running hot.
Replace the fan relay switch. The relay switch is tripped when the temperature sensor tells the computer the engine is too hot.
Until you get the relay switch replaced, you can either by-pass the
relay switch and directly connect the fans to the battery, or turn on
your A/C ALL the time and use it at a minimum setting. This will keep
the cooling fans running at all times.
locate and replace fan relay, or it maybe the fan itself (doubt it is the fan ) but to check fan remove plug from fan and plug in a ground wire then run power to fan to see if fan works, make sure you hook up the jumper wire for ground to the correct wire when checking, if all that doesn't tell you any thing locate coolant temp sensor on motor and replace
The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.