Engine Coolant Temperature (ECT) Sensor (LP1/LY7)
In the engine compartment, in the left side of the left cylinder head, between cylinders #2 and #4
Engine Coolant Temperature (ECT) Sensor (LS2)
In the engine compartment, towards the front of the left cylinder head, near #1 spark plug
SOURCE: cadilac cts
The black plastic grille around the fog lamp can be removed without tools. If you look through the slats, you'll see 5 or 6 "clips" that can be GENTLY released with your finger. Once the grille is out (which is about 4 inches high by about 14 inches long), you'll see that the fog lamp assembly can be removed with 3 screws. Simpler than you probably thought!
SOURCE: ATS(Air temp sensor) CTS( Coolant temp sensor)
I have a 351 but they are common sensors and should be located same places. ATC is on the side or bottom of the air intake filter box. The CTS should be located on the goose-neck where your Thermostat is housed; this is comming off the intake mannafold and into the radiator.
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 -ATC(MAF/IAT) & CTS SENSORS-2007 nissan frontier 4.0
maf is mass air flow sensor, it is on the air filter box, iat is intake air temp sensor, should be in the tube from the air filter box. don't know what atc and cts are sorry. best of luck
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