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.
SOURCE: Need location of fan relays on cadillac deville 2000
a relay panel is located under hood on passengers side
SOURCE: 1999 Cadillac Deville and the radiator fans are not coming on
you should check the fuse in the fuse boxe under the hood and find the radiator fan fuse
if the fuse is no longer good the little piece of metal will be cut in the middle so replace it with the same number if it's a 20 AMP do not put a 30 or a 15 AMP
if the fuse is good then there might be some problem with wires (could be cut) or the radiator fan motor is no longer good
you should have it check
Good luck
SOURCE: thermostat location on a 1999 cadillac deville concours
looked it up online and looks like it's on the front of the water pump in a thing called the coolant inlet housing. one end of it looks something like the letter y and the other end, where the thermostat is round. hope that helps
SOURCE: Cooling fan relay on a 1992 Cadillac Deville
Left Hand Side Of Engine Compartment On Relay Bracket
SOURCE: cadillac sedan deville fuse box location
lower left side on driver's side near the hood release.
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