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: 2003 cadillac cts coolant temperature sensor
I cant find a pic of the loctation.
It is under the intake in the back in the coolant bridge it is not bad
to change if you are not affaid to take the intakes off but to get to
it you have to take the intake off
SOURCE: location of temp sensor cadillac
Hello,
The coolant temp sensor is screwed into the rear head on the driver side down below the EGR valve, see this diagram
Thanks
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