Pop the hood
SOURCE: 99 cadillac de ville
the coolant temp sensor is at the rear of the engine and is a "bad word" to get to. the 3 relays are at the bottom,under the fans. if you remove the driver side fan out of the way( 2 10mm bolts holding the fan) you should have good access to them. they do have locks on them and may be tricky to unplug. there is a 7/16 nut holding the relay plate down. remove and it should be easy to remove them.
SOURCE: Location of coolant temperature sensor
Maybe this will help . although this is from a 1997 Caddy.
Cadillac DeVille Engine Coolant Temperature (ECT) Sensor Location
SOURCE: location of engine coolant temperature sensor on
It is a 2 wire seneor under the throttle body. You will have to remove the air breather and it will be a brass/black plastic sensor. A 3/4 socket will fit it.Good Luck
SOURCE: replacement of coolant temperature sensor
located under intake in water crossover pipe,you can access the sensor by removing intake chamber box,then pcv hose connected to the block,the connector is orangeish 2pin,use a 19mmdeep socket on a 3/8 ratchet to get it loose,make sure engine is cool,also make sure there is a new brass washer with your new sensor,sometimes the old washer comes off when removing the sensor,sometimes it sticks to the pipe,some coolant will escape so make sure to top it off
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