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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.
how long has it been since the thermostat has been changed.is the cooling fans working at the radiator if not you could have a bad fan motor or a cooling fan relay.it could even be a bad sensor that the computer monitors to turn on and off the cooling fan.this is a different sensor than the one that works the coolant gage or light on the dash.
Assuming the fuses are fine the most likely culprit is one of 3 fan relays located on the red cradle at the bottom of you rad. I had the same problem and repalced all 3 seeing as they are a pain to access
Are you sure that you don't mean the cooling fan control module? It should be located up front next to the cooling fan. It is square shaped and has a long square shaped plug going into it. Reads the temperature of the coolant and passes the information to the engine control computer (ECC). The ECC receives analog information and signals the cooling fan switch to cycle the cooling fan on or off, as required.